switch to git for external projects

Now that all the projects we care about use git and have repos available,
switch to them and away from the old googlecode svn repos.

TEST=`gclient sync` migrated svn->git fine
TEST=`make check` still passes
TEST=manual `diff -ur` on the new/old repos shows same content
BUG=
R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1560913002 .

DEPS

@@ -35,18 +35,26 @@
 deps = {
   # Logging code.
   "src/src/third_party/glog":
-    "http://google-glog.googlecode.com/svn/trunk@97",
+    "https://github.com/google/glog.git" +
+      "@ac3e91896917b5d9e8b4467bd912b20e8668488a",
 
   # Testing libraries and utilities.
-  "src/src/testing": "http://googlemock.googlecode.com/svn/trunk@408",
-  "src/src/testing/gtest": "http://googletest.googlecode.com/svn/trunk@615",
+  "src/src/testing":
+    "https://github.com/google/googlemock.git" +
+      "@ada23475e27babd85fb9c13250243f6acfd3ffd8",
+  "src/src/testing/gtest":
+    "https://github.com/google/googletest.git" +
+      "@a3b859162dd7a4a1798cf8753a03098f2cbdb62e",
 
   # Protobuf.
   "src/src/third_party/protobuf/protobuf":
-    "http://protobuf.googlecode.com/svn/trunk@407",
+    "https://github.com/google/protobuf.git" +
+      "@cb6dd4ef5f82e41e06179dcd57d3b1d9246ad6ac",
 
   # GYP project generator.
-  "src/src/tools/gyp": "http://gyp.googlecode.com/svn/trunk@1886",
+  "src/src/tools/gyp":
+    "https://chromium.googlesource.com/external/gyp/" +
+      "@e8ab0833a42691cd2184bd4c45d779e43821d3e0",
 
   # Linux syscall support.
   "src/src/third_party/lss":