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

third_party/harfbuzz/harfbuzz.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': 'harfbuzz',
       'type': '<(library)',
       'sources': [
         'src/harfbuzz-buffer.c',
         'src/harfbuzz-stream.c',
         'src/harfbuzz-dump.c',
         'src/harfbuzz-gdef.c',
         'src/harfbuzz-gpos.c',
@@ skipping 38 matching lines @@
         'include_dirs': [
           'contrib',
         ],
       },
       'dependencies': [
         '../../build/linux/system.gyp:freetype2',
       ],
     },
   ],
 }