[Mac] Implement NSObject zombies.

chrome/chrome_browser.gypi

 # Copyright (c) 2010 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': '<(library)',
       'msvs_guid': '5BF908A7-68FB-4A4B-99E3-8C749F1FE4EA',
@@ skipping 760 matching lines @@
         'browser/cocoa/notifications/balloon_view_bridge.h',
         'browser/cocoa/notifications/balloon_view_bridge.mm',
         'browser/cocoa/notifications/balloon_view_host_mac.h',
         'browser/cocoa/notifications/balloon_view_host_mac.mm',
         'browser/cocoa/notifications/balloon_view.h',
         'browser/cocoa/notifications/balloon_view.mm',
         'browser/cocoa/nsmenuitem_additions.h',
         'browser/cocoa/nsmenuitem_additions.mm',
         'browser/cocoa/objc_method_swizzle.h',
         'browser/cocoa/objc_method_swizzle.mm',
+        'browser/cocoa/objc_zombie.h',
+        'browser/cocoa/objc_zombie.mm',
         'browser/cocoa/page_info_window_controller.h',
         'browser/cocoa/page_info_window_controller.mm',
         'browser/cocoa/page_info_window_mac.h',
         'browser/cocoa/page_info_window_mac.mm',
         'browser/cocoa/preferences_window_controller.h',
         'browser/cocoa/preferences_window_controller.mm',
         'browser/cocoa/rwhvm_editcommand_helper.h',
         'browser/cocoa/rwhvm_editcommand_helper.mm',
         'browser/cocoa/repost_form_warning_mac.h',
         'browser/cocoa/repost_form_warning_mac.mm',
@@ skipping 2723 matching lines @@
       ],
     },
   ],
 }
 
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