Get rid of ui_cocoa_third_party_toolkits target from ui.gyp

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': [
     {
@@ skipping 106 matching lines @@
         ['use_ash==0', {
           'sources!': [
             'views/message_bubble_base.cc',
             'views/message_bubble_base.h',
             'views/message_center_bubble.cc',
             'views/message_center_bubble.h',
             'views/message_popup_bubble.cc',
             'views/message_popup_bubble.h',
           ],
         }],
-        ['OS=="mac"', {
-          'dependencies': [
-            '../ui.gyp:ui_cocoa_third_party_toolkits',
-          ],
-          'include_dirs': [
-            '../../third_party/GTM',
-          ],
-        }],
         ['toolkit_views==1', {
           'dependencies': [
             '../compositor/compositor.gyp:compositor',
           ],
         }],
         ['notifications==0', {  # Android and iOS.
           'sources/': [
             # Exclude everything except dummy impl.
             ['exclude', '\\.(cc|mm)$'],
             ['include', '^dummy_message_center\\.cc$'],
@@ skipping 89 matching lines @@
         # See http://crbug.com/162998#c4 for why this is needed.
         ['OS=="linux" and linux_use_tcmalloc==1', {
           'dependencies': [
             '../../base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
     },  # target_name: message_center_unittests
   ],
 }