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

sandbox/sandbox.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=="linux"', {
       'targets': [
         {
           'target_name': 'chrome_sandbox',
           'type': 'executable',
           'sources': [
             'linux/suid/sandbox.c',
           ],
           'include_dirs': [
@@ skipping 304 matching lines @@
             'POCDLL_EXPORTS',
           ],
           'include_dirs': [
             '..',
           ],
         },
       ],
     }],
   ],
 }