Make MessageCenter a singleton object and build on Windows.

ui/message_center/message_center.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': [
     {
       'target_name': 'message_center',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:base_i18n',
+        '../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../../skia/skia.gyp:skia',
         '../base/strings/ui_strings.gyp:ui_strings',
         '../compositor/compositor.gyp:compositor',
         '../ui.gyp:ui',
         '../ui.gyp:ui_resources',
         '../views/views.gyp:views',
       ],
       'defines': [
         'MESSAGE_CENTER_IMPLEMENTATION',
       ],
@@ skipping 34 matching lines @@
         '../../testing/gtest.gyp:gtest_main',
         '../ui.gyp:ui',
         'message_center',
       ],
       'sources': [
         'notification_list_unittest.cc',
       ],
     },
   ],
 }