Move image_unittest_util* into gfx_test_support target.

ui/gfx/gfx_tests.gyp

 # Copyright 2014 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': 'gfx_unittests',
       'type': '<(gtest_target_type)',
       # iOS uses a small subset of ui. common_sources are the only files that
       # are built on iOS.
       'common_sources' : [
         'font_unittest.cc',
         'image/image_family_unittest.cc',
         'image/image_ios_unittest.mm',
         'image/image_skia_unittest.cc',
         'image/image_unittest.cc',
-        'image/image_unittest_util.cc',
-        'image/image_unittest_util.h',
-        'image/image_unittest_util_ios.mm',
-        'image/image_unittest_util_mac.mm',
         'screen_unittest.cc',
         'test/run_all_unittests.cc',
         'text_elider_unittest.cc',
         'text_utils_unittest.cc',
       ],
       'all_sources': [
         '<@(_common_sources)',
         'animation/animation_container_unittest.cc',
         'animation/animation_unittest.cc',
         'animation/multi_animation_unittest.cc',
@@ skipping 152 matching lines @@
           ],
           'variables': {
             'test_suite_name': 'gfx_unittests',
           },
           'includes': [ '../../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }