[NOT FOR REVIEW] Significantly simplify the PlatformNotificationService //content API.

content/content_shell.gypi

 # 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': {
     'content_shell_product_name': 'Content Shell',
     # The "19" is so that sites that sniff for version think that this is
     # something reasonably current; the "77.34.5" is a hint that this isn't a
     # standard Chrome.
@@ skipping 51 matching lines @@
         '../storage/storage_browser.gyp:storage',
         '../third_party/WebKit/public/blink.gyp:blink',
         '../third_party/WebKit/public/blink.gyp:blink_test_support',
         '../ui/base/ime/ui_base_ime.gyp:ui_base_ime',
         '../ui/base/ui_base.gyp:ui_base',
         '../ui/events/events.gyp:events_base',
         '../ui/gfx/gfx.gyp:gfx',
         '../ui/gfx/gfx.gyp:gfx_geometry',
         '../ui/gfx/ipc/gfx_ipc.gyp:gfx_ipc',
         '../ui/gl/gl.gyp:gl',
+        '../ui/message_center/message_center.gyp:message_center',
         '../url/url.gyp:url_lib',
         '../v8/tools/gyp/v8.gyp:v8',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
         'shell/android/shell_jni_registrar.cc',
         'shell/android/shell_jni_registrar.h',
@@ skipping 1084 matching lines @@
                 '--input_symbol', '<(PRODUCT_DIR)/content_shell.exe.pdb',
                 '--destination_dir', '<(dest_dir)',
               ],
             },
           ],
         },
       ],
     }],  # OS=="win" and fastbuild==0 and target_arch=="ia32"
   ]
 }