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

ipc/ipc.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',
-  ],
   'target_defaults': {
     'sources/': [
       ['exclude', '/win/'],
       ['exclude', '_(posix|win)(_unittest)?\\.(cc|mm?)$'],
       ['exclude', '/win_[^/]*\\.cc$'],
     ],
     'conditions': [
       ['OS=="linux"', {'sources/': [
         ['include', '_posix(_unittest)?\\.cc$'],
       ]}],
@@ skipping 80 matching lines @@
         }],
         ['OS=="linux" and toolkit_views==1', {
           'dependencies': [
             '../views/views.gyp:views',
           ],
         }],
       ],
     },
   ]
 }