Update app list search box menu when Users changes

ui/app_list/app_list.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 27 matching lines @@
         'app_list_item_model_observer.h',
         'app_list_menu.cc',
         'app_list_menu.h',
         'app_list_model.cc',
         'app_list_model.h',
         'app_list_model_observer.h',
         'app_list_switches.cc',
         'app_list_switches.h',
         'app_list_view_delegate.cc',
         'app_list_view_delegate.h',
+        'app_list_view_delegate_observer.h',
         'cocoa/app_list_pager_view.h',
         'cocoa/app_list_pager_view.mm',
         'cocoa/app_list_view_controller.h',
         'cocoa/app_list_view_controller.mm',
         'cocoa/app_list_window_controller.h',
         'cocoa/app_list_window_controller.mm',
         'cocoa/apps_collection_view_drag_manager.h',
         'cocoa/apps_collection_view_drag_manager.mm',
         'cocoa/apps_grid_controller.h',
         'cocoa/apps_grid_controller.mm',
@@ skipping 192 matching lines @@
           'dependencies': [
             '../../base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
       # Disable c4267 warnings until we fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }