Force inclusion of build/common.gypi for all chromium gyp files.

testing/gtest.gyp

 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
-  'includes': [
-    '../build/common.gypi',
-  ],
   'targets': [
     {
       'target_name': 'gtest',
       'type': '<(library)',
       'msvs_guid': 'BFE8E2A7-3B3B-43B0-A994-3058B852DB8B',
       'sources': [
         # Sources based on files in r267 of gmock.
         'gtest/include/gtest/gtest-death-test.h',
         'gtest/include/gtest/gtest-message.h',
         'gtest/include/gtest/gtest-param-test.h',
@@ skipping 80 matching lines @@
       'type': '<(library)',
       'dependencies': [
         'gtest',
       ],
       'sources': [
         'gtest/src/gtest_main.cc',
       ],
     },
   ],
 }