Refactor Windows MessageBox fallback code.

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 2074 matching lines @@
         'browser/ui/views/screen_capture_notification_ui_views.cc',
         'browser/ui/views/select_file_dialog_extension.cc',
         'browser/ui/views/select_file_dialog_extension.h',
         'browser/ui/views/select_file_dialog_extension_factory.cc',
         'browser/ui/views/select_file_dialog_extension_factory.h',
         'browser/ui/views/signed_certificate_timestamps_views.cc',
         'browser/ui/views/signed_certificate_timestamps_views.h',
         'browser/ui/views/signed_certificate_timestamp_info_view.cc',
         'browser/ui/views/signed_certificate_timestamp_info_view.h',
         'browser/ui/views/simple_message_box_views.cc',
-        'browser/ui/views/simple_message_box_win.cc',
-        'browser/ui/views/simple_message_box_win.h',
         'browser/ui/views/speech_recognition_bubble_views.cc',
         'browser/ui/views/ssl_client_certificate_selector.cc',
         'browser/ui/views/ssl_client_certificate_selector.h',
         'browser/ui/views/status_bubble_views.cc',
         'browser/ui/views/status_bubble_views.h',
         'browser/ui/views/status_icons/status_icon_linux_wrapper.cc',
         'browser/ui/views/status_icons/status_icon_linux_wrapper.h',
         'browser/ui/views/status_icons/status_icon_win.cc',
         'browser/ui/views/status_icons/status_icon_win.h',
         'browser/ui/views/status_icons/status_tray_linux.cc',
@@ skipping 1305 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',
           ],
         }],
       ],
     },
   ],
 }