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

third_party/libpng/libpng.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',
-  ],
   'variables': {
     'use_system_libpng%': 0,
   },
   'conditions': [
     ['use_system_libpng==0', {
       'targets': [
         {
           'target_name': 'libpng',
           'type': '<(library)',
           'dependencies': [
@@ skipping 65 matching lines @@
             ],
             'libraries': [
               '<!@(pkg-config --libs-only-l libpng)',
             ],
           },
         },
       ],
     }],
   ],
 }