Move 'theme' parsing out of Extension class

chrome/chrome_common.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'common',
       'type': 'static_library',
       'variables': {
@@ skipping 226 matching lines @@
         'common/extensions/permissions/socket_permission.cc',
         'common/extensions/permissions/socket_permission.h',
         'common/extensions/permissions/socket_permission_data.cc',
         'common/extensions/permissions/socket_permission_data.h',
         'common/extensions/permissions/usb_device_permission.cc',
         'common/extensions/permissions/usb_device_permission.h',
         'common/extensions/permissions/usb_device_permission_data.cc',
         'common/extensions/permissions/usb_device_permission_data.h',
         'common/extensions/request_media_access_permission_helper.cc',
         'common/extensions/request_media_access_permission_helper.h',
+        'common/extensions/theme_handler.cc',
+        'common/extensions/theme_handler.h',
         'common/extensions/unpacker.cc',
         'common/extensions/unpacker.h',
         'common/extensions/update_manifest.cc',
         'common/extensions/update_manifest.h',
         'common/extensions/user_script.cc',
         'common/extensions/user_script.h',
         'common/extensions/value_counter.cc',
         'common/extensions/value_counter.h',
         'common/extensions/web_accessible_resources_handler.cc',
         'common/extensions/web_accessible_resources_handler.h',
@@ skipping 401 matching lines @@
         'common/metrics/proto/user_action_event.proto',
       ],
       'variables': {
         'proto_in_dir': 'common/metrics/proto',
         'proto_out_dir': 'chrome/common/metrics/proto',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
   ],
 }