Split feature definitions into extensions and chrome features.

extensions/extensions.gyp

 # Copyright 2013 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': 1,
   },
   'targets': [
     {
@@ skipping 78 matching lines @@
         'common/features/api_feature.cc',
         'common/features/api_feature.h',
         'common/features/base_feature_provider.cc',
         'common/features/base_feature_provider.h',
         'common/features/complex_feature.cc',
         'common/features/complex_feature.h',
         'common/features/feature.cc',
         'common/features/feature.h',
         'common/features/feature_provider.cc',
         'common/features/feature_provider.h',
+        'common/features/json_feature_provider_source.cc',
+        'common/features/json_feature_provider_source.h',
         'common/features/manifest_feature.cc',
         'common/features/manifest_feature.h',
         'common/features/permission_feature.cc',
         'common/features/permission_feature.h',
         'common/features/simple_feature.cc',
         'common/features/simple_feature.h',
         'common/features/simple_feature_filter.cc',
         'common/features/simple_feature_filter.h',
         'common/file_util.cc',
         'common/file_util.h',
@@ skipping 437 matching lines @@
         'test/test_extensions_client.cc',
         'test/test_extensions_client.h',
         'test/test_permission_message_provider.cc',
         'test/test_permission_message_provider.h',
         'test/test_permissions_provider.cc',
         'test/test_permissions_provider.h',
       ],
     },
   ]
 }