cc: Drop ContextProvider references on the impl thread before quitting

cc/cc.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 317 matching lines @@
         'resources/scoped_resource.cc',
         'resources/scoped_resource.h',
         'resources/scoped_ui_resource.cc',
         'resources/scoped_ui_resource.h',
         'resources/skpicture_content_layer_updater.cc',
         'resources/skpicture_content_layer_updater.h',
         'resources/sync_point_helper.cc',
         'resources/sync_point_helper.h',
         'resources/texture_mailbox.cc',
         'resources/texture_mailbox.h',
+        'resources/texture_mailbox_deleter.cc',
+        'resources/texture_mailbox_deleter.h',
         'resources/tile.cc',
         'resources/tile.h',
         'resources/tile_manager.cc',
         'resources/tile_manager.h',
         'resources/tile_priority.cc',
         'resources/tile_priority.h',
         'resources/transferable_resource.cc',
         'resources/transferable_resource.h',
         'resources/ui_resource_bitmap.cc',
         'resources/ui_resource_bitmap.h',
@@ skipping 47 matching lines @@
         'trees/thread_proxy.cc',
         'trees/thread_proxy.h',
         'trees/tree_synchronizer.cc',
         'trees/tree_synchronizer.h',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }