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

third_party/protobuf2/protobuf.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',
-  ],
   'conditions': [
     ['OS!="win"', {
       'variables': {
         'config_h_dir':
           '.',  # crafted for gcc/linux.
       },
     }, {  # else, OS=="win"
       'variables': {
         'config_h_dir':
           'src/vsprojects',  # crafted for msvc.
@@ skipping 156 matching lines @@
         'protobuf',
       ],
 
       'include_dirs': [
         '<(config_h_dir)',
         'src/src',
       ],
     },
   ],
  }