diff --git a/src/build/common.gypi b/src/build/common.gypi
index 52d5686e..f3a0e23b 100644
--- a/src/build/common.gypi
+++ b/src/build/common.gypi
@@ -31,34 +31,13 @@
 # since gyp_chromium is automatically forcing its inclusion.
 {
   'variables': {
-    # .gyp files or targets should set chromium_code to 1 if they build
-    # Chromium-specific code, as opposed to external code.  This variable is
-    # used to control such things as the set of warnings to enable, and
-    # whether warnings are treated as errors.
-    'chromium_code%': 0,
-
     # Variables expected to be overriden on the GYP command line (-D) or by
     # ~/.gyp/include.gypi.
 
     # Putting a variables dict inside another variables dict looks kind of
-    # weird.  This is done so that "branding" and "buildtype" are defined as
-    # variables within the outer variables dict here.  This is necessary
-    # to get these variables defined for the conditions within this variables
-    # dict that operate on these variables.
+    # weird. This is necessary to get these variables defined for the conditions
+    # within this variables dict that operate on these variables.
     'variables': {
-      # Override branding to select the desired branding flavor.
-      'branding%': 'Chromium',
-
-      # Override buildtype to select the desired build flavor.
-      # Dev - everyday build for development/testing
-      # Official - release build (generally implies additional processing)
-      # TODO(mmoss) Once 'buildtype' is fully supported (e.g. Windows gyp
-      # conversion is done), some of the things which are now controlled by
-      # 'branding', such as symbol generation, will need to be refactored based
-      # on 'buildtype' (i.e. we don't care about saving symbols for non-Official
-      # builds).
-      'buildtype%': 'Dev',
-
       'variables': {
         # Compute the architecture that we're building on.
         'conditions': [
@@ -72,49 +51,19 @@
             'host_arch%': 'ia32',
           }],
         ],
-
-        # Whether we're building a ChromeOS build.  We set the initial
-        # value at this level of nesting so it's available for the
-        # toolkit_views test below.
-        'chromeos%': '0',
       },
 
-      # Set default value of toolkit_views on for Windows and Chrome OS.
-      # We set it at this level of nesting so the value is available for
-      # other conditionals below.
-      'conditions': [
-        ['OS=="win" or chromeos==1', {
-          'toolkit_views%': 1,
-        }, {
-          'toolkit_views%': 0,
-        }],
-      ],
-
       'host_arch%': '<(host_arch)',
 
       # Default architecture we're building for is the architecture we're
       # building on.
       'target_arch%': '<(host_arch)',
 
-      # We do want to build Chromium with Breakpad support in certain
-      # situations. I.e. for Chrome bot.
-      'linux_chromium_breakpad%': 0,
-      # And if we want to dump symbols.
-      'linux_chromium_dump_symbols%': 0,
-      # Also see linux_strip_binary below.
-
-      # Copy conditionally-set chromeos variable out one scope.
-      'chromeos%': '<(chromeos)',
-
       # This variable tells WebCore.gyp and JavaScriptCore.gyp whether they are
       # are built under a chromium full build (1) or a webkit.org chromium
       # build (0).
       'inside_chromium_build%': 1,
 
-      # Set to 1 to enable fast builds. It disables debug info for fastest
-      # compilation.
-      'fastbuild%': 0,
-
       # Set to 1 compile with -fPIC cflag on linux. This is a must for shared
       # libraries on linux x86-64 and arm.
       'linux_fpic%': 0,
@@ -135,16 +84,9 @@
       'disable_sse2%': 0,
     },
 
-    # Define branding and buildtype on the basis of their settings within the
-    # variables sub-dict above, unless overridden.
-    'branding%': '<(branding)',
-    'buildtype%': '<(buildtype)',
     'target_arch%': '<(target_arch)',
     'host_arch%': '<(host_arch)',
-    'toolkit_views%': '<(toolkit_views)',
-    'chromeos%': '<(chromeos)',
     'inside_chromium_build%': '<(inside_chromium_build)',
-    'fastbuild%': '<(fastbuild)',
     'linux_fpic%': '<(linux_fpic)',
     'python_ver%': '<(python_ver)',
     'arm_version%': '<(arm_version)',
@@ -267,55 +209,14 @@
         'gcc_version%': '<!(python <(DEPTH)/build/compiler_version.py)',
         # Figure out the python architecture to decide if we build pyauto.
         'python_arch%': '<!(<(DEPTH)/build/linux/python_arch.sh <(sysroot)/usr/lib/libpython<(python_ver).so.1.0)',
-        'conditions': [
-          ['branding=="Chrome" or linux_chromium_breakpad==1', {
-            'linux_breakpad%': 1,
-          }, {
-            'linux_breakpad%': 0,
-          }],
-          # All Chrome builds have breakpad symbols, but only process the
-          # symbols from official builds.
-          # TODO(mmoss) dump_syms segfaults on x64. Enable once dump_syms and
-          # crash server handle 64-bit symbols.
-          ['linux_chromium_dump_symbols==1 or '
-           '(branding=="Chrome" and buildtype=="Official" and '
-           'target_arch=="ia32")', {
-            'linux_dump_symbols%': 1,
-          }, {
-            'linux_dump_symbols%': 0,
-          }],
-          ['toolkit_views==0', {
-            # GTK wants Title Case strings
-            'use_titlecase_in_grd_files%': 1,
-          }],
-        ],
+        'linux_breakpad%': 1,
+        'linux_dump_symbols%': 1,
       }],  # OS=="linux" or OS=="freebsd" or OS=="openbsd"
       ['OS=="mac"', {
         # Mac wants Title Case strings
         'use_titlecase_in_grd_files%': 1,
-        'conditions': [
-          # mac_product_name is set to the name of the .app bundle as it should
-          # appear on disk.  This duplicates data from
-          # chrome/app/theme/chromium/BRANDING and
-          # chrome/app/theme/google_chrome/BRANDING, but is necessary to get
-          # these names into the build system.
-          ['branding=="Chrome"', {
-            'mac_product_name%': 'Google Chrome',
-          }, { # else: branding!="Chrome"
-            'mac_product_name%': 'Chromium',
-          }],
-
-          # Feature variables for enabling Mac Breakpad and Keystone auto-update
-          # support.  Both features are on by default in official builds with
-          # Chrome branding.
-          ['branding=="Chrome" and buildtype=="Official"', {
-            'mac_breakpad%': 1,
-            'mac_keystone%': 1,
-          }, { # else: branding!="Chrome" or buildtype!="Official"
-            'mac_breakpad%': 0,
-            'mac_keystone%': 0,
-          }],
-        ],
+        'mac_breakpad%': 0,
+        'mac_keystone%': 0,
       }],  # OS=="mac"
       # Whether to use multiple cores to compile with visual studio. This is
       # optional because it sometimes causes corruption on VS 2005.
@@ -351,7 +252,7 @@
       }],
       # Compute based on OS, target architecture and device whether GLES
       # is supported
-      [ 'OS=="linux" and target_arch=="arm" and chromeos==1', {
+      [ 'OS=="linux" and target_arch=="arm"', {
         # Enable a variable used elsewhere throughout the GYP files to determine
         # whether to compile in the sources for the GLES support.
         'enable_gles%': 1,
@@ -373,17 +274,6 @@
   },
   'target_defaults': {
     'variables': {
-      # The condition that operates on chromium_code is in a target_conditions
-      # section, and will not have access to the default fallback value of
-      # chromium_code at the top of this file, or to the chromium_code
-      # variable placed at the root variables scope of .gyp files, because
-      # those variables are not set at target scope.  As a workaround,
-      # if chromium_code is not set at target scope, define it in target scope
-      # to contain whatever value it has during early variable expansion.
-      # That's enough to make it available during target conditional
-      # processing.
-      'chromium_code%': '<(chromium_code)',
-
       # See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Optimize-Options.html
       'mac_release_optimization%': '3', # Use -O3 unless overridden
       'mac_debug_optimization%': '0',   # Use -O0 unless overridden
@@ -399,34 +289,6 @@
       'release_valgrind_build%': 0,
     },
     'conditions': [
-      ['branding=="Chrome"', {
-        'defines': ['GOOGLE_CHROME_BUILD'],
-      }, {  # else: branding!="Chrome"
-        'defines': ['CHROMIUM_BUILD'],
-      }],
-      ['toolkit_views==1', {
-        'defines': ['TOOLKIT_VIEWS=1'],
-      }],
-      ['chromeos==1', {
-        'defines': ['OS_CHROMEOS=1'],
-      }],
-      ['fastbuild!=0', {
-        'conditions': [
-          # Finally, for Windows, we simply turn on profiling.
-          ['OS=="win"', {
-            'msvs_settings': {
-              'VCLinkerTool': {
-                'GenerateDebugInformation': 'false',
-              },
-              'VCCLCompilerTool': {
-                'DebugInformationFormat': '0',
-              }
-            }
-          }, { # else: OS != "win"
-            'cflags': [ '-g1' ],
-          }],
-        ],  # conditions for fastbuild.
-      }],  # fastbuild!=0
       ['selinux==1', {
         'defines': ['CHROMIUM_SELINUX=1'],
       }],
@@ -488,82 +350,32 @@
       }],  # coverage!=0
     ],  # conditions for 'target_defaults'
     'target_conditions': [
-      ['chromium_code==0', {
-        'conditions': [
-          [ 'OS=="linux" or OS=="freebsd" or OS=="openbsd"', {
-            'cflags!': [
-              '-Wall',
-              '-Wextra',
-              '-Werror',
-            ],
-          }],
-          [ 'OS=="win"', {
-            'defines': [
-              '_CRT_SECURE_NO_DEPRECATE',
-              '_CRT_NONSTDC_NO_WARNINGS',
-              '_CRT_NONSTDC_NO_DEPRECATE',
-            ],
-            'msvs_disabled_warnings': [4800],
-            'msvs_settings': {
-              'VCCLCompilerTool': {
-                'WarnAsError': 'true',
-                'Detect64BitPortabilityProblems': 'false',
-              },
-            },
-          }],
-          [ 'OS=="mac"', {
-            'xcode_settings': {
-              'GCC_TREAT_WARNINGS_AS_ERRORS': 'NO',
-              'WARNING_CFLAGS!': ['-Wall'],
-            },
-          }],
+      [ 'OS=="linux" or OS=="freebsd" or OS=="openbsd"', {
+        'cflags!': [
+          '-Wall',
+          '-Wextra',
+          '-Werror',
         ],
-      }, {
-        # In Chromium code, we define __STDC_FORMAT_MACROS in order to get the
-        # C99 macros on Mac and Linux.
+      }],
+      [ 'OS=="win"', {
         'defines': [
-          '__STDC_FORMAT_MACROS',
-        ],
-        'conditions': [
-          ['OS!="win"', {
-            'sources/': [ ['exclude', '_win(_unittest)?\\.cc$'],
-                          ['exclude', '/win/'],
-                          ['exclude', '/win_[^/]*\\.cc$'] ],
-          }],
-          ['OS!="mac"', {
-            'sources/': [ ['exclude', '_(cocoa|mac)(_unittest)?\\.cc$'],
-                          ['exclude', '/(cocoa|mac)/'],
-                          ['exclude', '\.mm?$' ] ],
-          }],
-          ['OS!="linux" and OS!="freebsd" and OS!="openbsd"', {
-            'sources/': [
-              ['exclude', '_(chromeos|gtk|x|x11|xdg)(_unittest)?\\.cc$'],
-              ['exclude', '/gtk/'],
-              ['exclude', '/(gtk|x11)_[^/]*\\.cc$'],
-            ],
-          }],
-          ['OS!="linux"', {
-            'sources/': [
-              ['exclude', '_linux(_unittest)?\\.cc$'],
-              ['exclude', '/linux/'],
-            ],
-          }],
-          # We use "POSIX" to refer to all non-Windows operating systems.
-          ['OS=="win"', {
-            'sources/': [ ['exclude', '_posix\\.cc$'] ],
-          }],
-          # Though Skia is conceptually shared by Linux and Windows,
-          # the only _skia files in our tree are Linux-specific.
-          ['OS!="linux" and OS!="freebsd" and OS!="openbsd"', {
-            'sources/': [ ['exclude', '_skia\\.cc$'] ],
-          }],
-          ['chromeos!=1', {
-            'sources/': [ ['exclude', '_chromeos\\.cc$'] ]
-          }],
-          ['toolkit_views==0', {
-            'sources/': [ ['exclude', '_views\\.cc$'] ]
-          }],
+          '_CRT_SECURE_NO_DEPRECATE',
+          '_CRT_NONSTDC_NO_WARNINGS',
+          '_CRT_NONSTDC_NO_DEPRECATE',
         ],
+        'msvs_disabled_warnings': [4800],
+        'msvs_settings': {
+          'VCCLCompilerTool': {
+            'WarnAsError': 'true',
+            'Detect64BitPortabilityProblems': 'false',
+          },
+        },
+      }],
+      [ 'OS=="mac"', {
+        'xcode_settings': {
+          'GCC_TREAT_WARNINGS_AS_ERRORS': 'NO',
+          'WARNING_CFLAGS!': ['-Wall'],
+        },
       }],
     ],  # target_conditions for 'target_defaults'
     'default_configuration': 'Debug',
@@ -714,7 +526,30 @@
         'inherit_from': ['Common_Base', 'x86_Base', 'Release_Base'],
         'conditions': [
           ['msvs_use_common_release', {
-            'includes': ['release.gypi'],
+            'defines': ['OFFICIAL_BUILD'],
+            'msvs_settings': {
+              'VCCLCompilerTool': {
+                'Optimization': '3',
+                'StringPooling': 'true',
+                'OmitFramePointers': 'true',
+                'InlineFunctionExpansion': '2',
+                'EnableIntrinsicFunctions': 'true',
+                'FavorSizeOrSpeed': '2',
+                'OmitFramePointers': 'true',
+                'EnableFiberSafeOptimizations': 'true',
+                'WholeProgramOptimization': 'true',
+              },
+              'VCLibrarianTool': {
+                'AdditionalOptions': ['/ltcg', '/expectedoutputsize:120000000'],
+              },
+              'VCLinkerTool': {
+                'LinkIncremental': '1',
+                'OptimizeReferences': '2',
+                'EnableCOMDATFolding': '2',
+                'OptimizeForWindows98': '1',
+                'LinkTimeCodeGeneration': '1',
+              },
+            },
           }],
         ]
       },
@@ -931,22 +766,13 @@
             # compiler optimized the code, since the value is always kept
             # in its specified precision.
             'conditions': [
-              ['branding=="Chromium" and disable_sse2==0', {
+              ['disable_sse2==0', {
                 'cflags': [
                   '-march=pentium4',
                   '-msse2',
                   '-mfpmath=sse',
                 ],
               }],
-              # ChromeOS targets Pinetrail, which is sse3, but most of the
-              # benefit comes from sse2 so this setting allows ChromeOS
-              # to build on other CPUs.  In the future -march=atom would help
-              # but requires a newer compiler.
-              ['chromeos==1 and disable_sse2==0', {
-                'cflags': [
-                  '-msse2',
-                ],
-              }],
             ],
             # -mmmx allows mmintrin.h to be used for mmx intrinsics.
             # video playback is mmx and sse2 optimized.
@@ -1022,9 +848,6 @@
             'cflags': [ '-gstabs' ],
             'defines': ['USE_LINUX_BREAKPAD'],
           }],
-          ['linux_use_seccomp_sandbox==1 and buildtype!="Official"', {
-            'defines': ['USE_SECCOMP_SANDBOX'],
-          }],
           ['library=="shared_library"', {
             # When building with shared libraries, remove the visiblity-hiding
             # flag.
diff --git a/src/build/external_code.gypi b/src/build/external_code.gypi
deleted file mode 100644
index 57fa8805..00000000
--- a/src/build/external_code.gypi
+++ /dev/null
@@ -1,64 +0,0 @@
-# Copyright 2010 Google Inc. All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-{
-  'conditions': [
-    [ 'OS=="linux"', {
-      'target_defaults': {
-        'cflags!': [
-          '-Wall',
-          '-Werror',
-        ],
-      },
-    }],
-    [ 'OS=="win"', {
-      'target_defaults': {
-        'defines': [
-          '_CRT_SECURE_NO_DEPRECATE',
-          '_CRT_NONSTDC_NO_WARNINGS',
-          '_CRT_NONSTDC_NO_DEPRECATE',
-        ],
-        'msvs_disabled_warnings': [4800],
-        'msvs_settings': {
-          'VCCLCompilerTool': {
-            'WarnAsError': 'false',
-            'Detect64BitPortabilityProblems': 'false',
-          },
-        },
-      },
-    }],
-    [ 'OS=="mac"', {
-      'target_defaults': {
-        'xcode_settings': {
-          'GCC_TREAT_WARNINGS_AS_ERRORS': 'NO',
-          'WARNING_CFLAGS!': ['-Wall'],
-        },
-      },
-    }],
-  ],
-}
diff --git a/src/build/internal/release_defaults.gypi b/src/build/internal/release_defaults.gypi
deleted file mode 100644
index 1bf6bbee..00000000
--- a/src/build/internal/release_defaults.gypi
+++ /dev/null
@@ -1,15 +0,0 @@
-{
-  'msvs_settings': {
-    'VCCLCompilerTool': {
-      'Optimization': '2',
-      'StringPooling': 'true',
-      'OmitFramePointers': 'true',
-    },
-    'VCLinkerTool': {
-      'LinkIncremental': '1',
-      'OptimizeReferences': '2',
-      'EnableCOMDATFolding': '2',
-      'OptimizeForWindows98': '1',
-    },
-  },
-}
diff --git a/src/build/internal/release_impl.gypi b/src/build/internal/release_impl.gypi
deleted file mode 100644
index aff06dc6..00000000
--- a/src/build/internal/release_impl.gypi
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  'includes': ['release_defaults.gypi'],
-}
diff --git a/src/build/internal/release_impl_official.gypi b/src/build/internal/release_impl_official.gypi
deleted file mode 100644
index 18f79282..00000000
--- a/src/build/internal/release_impl_official.gypi
+++ /dev/null
@@ -1,21 +0,0 @@
-{
-  'includes': ['release_defaults.gypi'],
-  'defines': ['OFFICIAL_BUILD'],
-  'msvs_settings': {
-    'VCCLCompilerTool': {
-      'Optimization': '3',
-      'InlineFunctionExpansion': '2',
-      'EnableIntrinsicFunctions': 'true',
-      'FavorSizeOrSpeed': '2',
-      'OmitFramePointers': 'true',
-      'EnableFiberSafeOptimizations': 'true',
-      'WholeProgramOptimization': 'true',
-    },
-    'VCLibrarianTool': {
-      'AdditionalOptions': ['/ltcg', '/expectedoutputsize:120000000'],
-    },
-    'VCLinkerTool': {
-      'LinkTimeCodeGeneration': '1',
-    },
-  },
-}
diff --git a/src/build/release.gypi b/src/build/release.gypi
deleted file mode 100644
index 4b012b51..00000000
--- a/src/build/release.gypi
+++ /dev/null
@@ -1,18 +0,0 @@
-{
-  'conditions': [
-    # Handle build types.
-    ['buildtype=="Dev"', {
-      'includes': ['internal/release_impl.gypi'],
-    }],
-    ['buildtype=="Official"', {
-      'includes': ['internal/release_impl_official.gypi'],
-    }],
-    # TODO(bradnelson): may also need:
-    #     checksenabled
-    #     coverage
-    #     dom_stats
-    #     pgo_instrument
-    #     pgo_optimize
-    #     purify
-  ],
-}