gfx: Create a separate gfx component out of ui.

tools/set_default_handler/set_default_handler.gyp

 # Copyright (c) 2013 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': [
     {
       'target_name': 'set_default_handler',
       'type': 'executable',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../win8/win8.gyp:test_support_win8',
+        '../../ui/gfx/gfx.gyp:gfx',
         '../../ui/ui.gyp:ui',
       ],
       'include_dirs': [
         '../..',
       ],
       'sources': [
         'set_default_handler_main.cc',
       ],
     },
   ],
 }