Fine tuned availability of hotword plugin.

chrome/chrome_browser_ui.gypi

 # Copyright 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': 'browser_ui',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 219 matching lines @@
         'browser/ui/app_list/search/tokenized_string_match.h',
         'browser/ui/app_list/search/webstore/webstore_installer.cc',
         'browser/ui/app_list/search/webstore/webstore_installer.h',
         'browser/ui/app_list/search/webstore/webstore_provider.cc',
         'browser/ui/app_list/search/webstore/webstore_provider.h',
         'browser/ui/app_list/search/webstore/webstore_result.cc',
         'browser/ui/app_list/search/webstore/webstore_result.h',
         'browser/ui/app_list/start_page_observer.h',
         'browser/ui/app_list/start_page_service.cc',
         'browser/ui/app_list/start_page_service.h',
+        'browser/ui/app_list/start_page_service_factory.cc',
+        'browser/ui/app_list/start_page_service_factory.h',
         'browser/ui/app_modal_dialogs/app_modal_dialog.cc',
         'browser/ui/app_modal_dialogs/app_modal_dialog.h',
         'browser/ui/app_modal_dialogs/app_modal_dialog_queue.cc',
         'browser/ui/app_modal_dialogs/app_modal_dialog_queue.h',
         'browser/ui/app_modal_dialogs/javascript_app_modal_dialog.cc',
         'browser/ui/app_modal_dialogs/javascript_app_modal_dialog.h',
         'browser/ui/app_modal_dialogs/javascript_dialog_manager.cc',
         'browser/ui/app_modal_dialogs/javascript_dialog_manager.h',
         'browser/ui/app_modal_dialogs/native_app_modal_dialog.h',
         'browser/ui/apps/app_info_dialog.h',
@@ skipping 3154 matching lines @@
             'browser/ui/webui/local_discovery/local_discovery_ui.cc',
             'browser/ui/webui/local_discovery/local_discovery_ui.h',
             'browser/ui/webui/local_discovery/local_discovery_ui_handler.cc',
             'browser/ui/webui/local_discovery/local_discovery_ui_handler.h',
           ],
         }],
       ],
     },
   ],
 }