Consolidate message observer API for win and aura (and touch).

chrome/chrome_browser.gypi

 # Copyright (c) 2011 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',
       'type': 'static_library',
       'dependencies': [
@@ skipping 1558 matching lines @@
         'browser/net/view_http_cache_job_factory.cc',
         'browser/net/view_http_cache_job_factory.h',
         'browser/notifications/balloon.cc',
         'browser/notifications/balloon.h',
         'browser/notifications/balloon_collection.cc',
         'browser/notifications/balloon_collection.h',
         'browser/notifications/balloon_collection_base.cc',
         'browser/notifications/balloon_collection_base.h',
         'browser/notifications/balloon_collection_impl.cc',
         'browser/notifications/balloon_collection_impl.h',
-        'browser/notifications/balloon_collection_linux.cc',
+        'browser/notifications/balloon_collection_gtk.cc',
         'browser/notifications/balloon_collection_mac.mm',
         'browser/notifications/balloon_collection_win.cc',
         'browser/notifications/balloon_host.cc',
         'browser/notifications/balloon_host.h',
         'browser/notifications/desktop_notification_service.cc',
         'browser/notifications/desktop_notification_service.h',
         'browser/notifications/desktop_notification_service_factory.cc',
         'browser/notifications/desktop_notification_service_factory.h',
         'browser/notifications/notification.cc',
         'browser/notifications/notification.h',
@@ skipping 3474 matching lines @@
               # weak imports in dependents, who still must #include
               # closure_blocks_leopard_compat.h to get weak imports.
               'type': 'none',
             }],
           ],
         },
       ],
     }],
   ],
 }