Remove common.gypi includes from expat and libjingle.

third_party/expat/expat.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': [
       '_LIB',
       'COMPILED_FROM_DSP',
       'XML_STATIC',  # Compile for static linkage.
     ],
     'include_dirs': [
       'files/lib',
     ],
     'dependencies': [
@@ skipping 18 matching lines @@
         'include_dirs': [
           'files/lib'
         ],
         'defines': [
           'XML_STATIC',  # Tell dependants to expect static linkage.
         ],
       }
     },
   ],
 }