Removing chrome.pushMessaging API

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 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': {
     'chrome_browser_extensions_chromeos_sources': [
       'browser/extensions/api/enterprise_platform_keys/enterprise_platform_keys_api.cc',
       'browser/extensions/api/enterprise_platform_keys/enterprise_platform_keys_api.h',
       'browser/extensions/api/enterprise_platform_keys_private/enterprise_platform_keys_private_api.cc',
@@ skipping 356 matching lines @@
       'browser/extensions/api/processes/processes_api.cc',
       'browser/extensions/api/processes/processes_api.h',
       'browser/extensions/api/processes/processes_api_constants.cc',
       'browser/extensions/api/processes/processes_api_constants.h',
       'browser/extensions/api/proxy/proxy_api.cc',
       'browser/extensions/api/proxy/proxy_api.h',
       'browser/extensions/api/proxy/proxy_api_constants.cc',
       'browser/extensions/api/proxy/proxy_api_constants.h',
       'browser/extensions/api/proxy/proxy_api_helpers.cc',
       'browser/extensions/api/proxy/proxy_api_helpers.h',
-      'browser/extensions/api/push_messaging/obfuscated_gaia_id_fetcher.cc',
-      'browser/extensions/api/push_messaging/obfuscated_gaia_id_fetcher.h',
-      'browser/extensions/api/push_messaging/push_messaging_api.cc',
-      'browser/extensions/api/push_messaging/push_messaging_api.h',
-      'browser/extensions/api/push_messaging/push_messaging_invalidation_handler.cc',
-      'browser/extensions/api/push_messaging/push_messaging_invalidation_handler.h',
-      'browser/extensions/api/push_messaging/push_messaging_invalidation_handler_delegate.h',
-      'browser/extensions/api/push_messaging/push_messaging_invalidation_mapper.h',
       'browser/extensions/api/reading_list_private/reading_list_private_api.cc',
       'browser/extensions/api/reading_list_private/reading_list_private_api.h',
       'browser/extensions/api/runtime/chrome_runtime_api_delegate.cc',
       'browser/extensions/api/runtime/chrome_runtime_api_delegate.h',
       'browser/extensions/api/screenlock_private/screenlock_private_api.cc',
       'browser/extensions/api/screenlock_private/screenlock_private_api.h',
       'browser/extensions/api/sessions/session_id.cc',
       'browser/extensions/api/sessions/session_id.h',
       'browser/extensions/api/sessions/sessions_api.cc',
       'browser/extensions/api/sessions/sessions_api.h',
@@ skipping 658 matching lines @@
           ],
         }, {  # use_brlapi==0
           'sources': [
             'browser/extensions/api/braille_display_private/braille_controller_stub.cc',
           ],
         }],
       ],
     },
   ],
 }