Remove common.gypi includes from expat and libjingle.

third_party/libjingle/libjingle.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': {
     'defines': [
       'FEATURE_ENABLE_SSL',
       'FEATURE_ENABLE_VOICEMAIL',  # TODO(ncarter): Do we really need this?
       'COMPILER_MSVC',
       '_USE_32BIT_TIME_T',
     ],
     'include_dirs': [
       './overrides',
       './files',
@@ skipping 226 matching lines @@
         'files/talk/xmpp/xmpptask.h',
         'overrides/base/basictypes.h',
         'overrides/base/constructormagic.h',
         'overrides/base/scoped_ptr.h',
         'overrides/config.h',
       ],
     },
   ],
 }