Move "oauth2" manifest key 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 116 matching lines @@
         'common/custom_handlers/protocol_handler.cc',
         'common/custom_handlers/protocol_handler.h',
         'common/descriptors_android.h',
         'common/extensions/api/extension_action/script_badge_handler.cc',
         'common/extensions/api/extension_action/script_badge_handler.h',
         'common/extensions/api/extension_action/action_info.cc',
         'common/extensions/api/extension_action/action_info.h',
         'common/extensions/api/extension_api.cc',
         'common/extensions/api/extension_api.h',
         'common/extensions/api/extension_api_stub.cc',
+        'common/extensions/api/identity/oauth2_manifest_handler.cc',
+        'common/extensions/api/identity/oauth2_manifest_handler.h',
         'common/extensions/api/input_ime/input_components_handler.cc',
         'common/extensions/api/input_ime/input_components_handler.h',
         'common/extensions/api/file_handlers/file_handlers_parser.cc',
         'common/extensions/api/file_handlers/file_handlers_parser.h',
         'common/extensions/api/omnibox/omnibox_handler.cc',
         'common/extensions/api/omnibox/omnibox_handler.h',
         'common/extensions/api/speech/tts_engine_manifest_handler.cc',
         'common/extensions/api/speech/tts_engine_manifest_handler.h',
         'common/extensions/command.cc',
         'common/extensions/command.h',
@@ skipping 511 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' ],
     },
   ],
 }