Attempt at fixing possible shutdown crash

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 1858 matching lines @@
         'browser/ui/views/frame/browser_frame_common_win.h',
         'browser/ui/views/frame/browser_non_client_frame_view.cc',
         'browser/ui/views/frame/browser_non_client_frame_view.h',
         'browser/ui/views/frame/browser_non_client_frame_view_ash.h',
         'browser/ui/views/frame/browser_non_client_frame_view_ash.cc',
         'browser/ui/views/frame/browser_non_client_frame_view_factory_aura.cc',
         'browser/ui/views/frame/browser_non_client_frame_view_factory_win.cc',
         'browser/ui/views/frame/browser_non_client_frame_view_factory_x11.cc',
         'browser/ui/views/frame/browser_root_view.cc',
         'browser/ui/views/frame/browser_root_view.h',
+        'browser/ui/views/frame/browser_shutdown.cc',
+        'browser/ui/views/frame/browser_shutdown.h',
         'browser/ui/views/frame/browser_view.cc',
         'browser/ui/views/frame/browser_view.h',
         'browser/ui/views/frame/browser_view_layout.cc',
         'browser/ui/views/frame/browser_view_layout.h',
         'browser/ui/views/frame/browser_view_layout_delegate.h',
         'browser/ui/views/frame/browser_window_property_manager_win.cc',
         'browser/ui/views/frame/browser_window_property_manager_win.h',
         'browser/ui/views/frame/contents_layout_manager.cc',
         'browser/ui/views/frame/contents_layout_manager.h',
         'browser/ui/views/frame/contents_web_view.cc',
@@ skipping 1505 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',
           ],
         }],
       ],
     },
   ],
 }