win: replace a while loop with a for loop

This is the recommended resolution to warning C4127.
https://msdn.microsoft.com/en-us/library/6t66728h.aspx

Change-Id: Ifcffe68e21d9a6383bb9aef07503cbb034caca19
Reviewed-on: https://chromium-review.googlesource.com/1191661
Reviewed-by: Ivan Penkov <ivanpe@chromium.org>

src/client/windows/handler/exception_handler.cc

@@ -388,7 +388,7 @@ DWORD ExceptionHandler::ExceptionHandlerThreadMain(void* lpParameter) {
   assert(self->handler_start_semaphore_ != NULL);
   assert(self->handler_finish_semaphore_ != NULL);
 
-  while (true) {
+  for(;;) {
     if (WaitForSingleObject(self->handler_start_semaphore_, INFINITE) ==
         WAIT_OBJECT_0) {
       // Perform the requested action.