cc: Fix build issues for adding ‘chromium_code’: 1 to cc.gyp and cc_tests.gyp

cc/cc.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
+    'chromium_code': 0,
     'cc_source_files': [
       'animation/animation.cc',
       'animation/animation.h',
       'animation/animation_curve.cc',
       'animation/animation_curve.h',
       'animation/animation_events.h',
       'animation/animation_id_provider.cc',
       'animation/animation_id_provider.h',
       'animation/animation_registrar.cc',
       'animation/animation_registrar.h',
@@ skipping 356 matching lines @@
         'CC_IMPLEMENTATION=1',
       ],
       'sources': [
         '<@(cc_source_files)',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }