Revert r150228 "Add support for PNG representation in gfx::Image"

ui/ui_unittests.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'ui_test_support',
       'type': 'static_library',
       'includes': [
@@ skipping 83 matching lines @@
         'gfx/color_analysis_unittest.cc',
         'gfx/color_utils_unittest.cc',
         'gfx/display_unittest.cc',
         'gfx/font_list_unittest.cc',
         'gfx/font_unittest.cc',
         'gfx/image/image_mac_unittest.mm',
         'gfx/image/image_skia_unittest.cc',
         'gfx/image/image_unittest.cc',
         'gfx/image/image_unittest_util.cc',
         'gfx/image/image_unittest_util.h',
-        'gfx/image/image_unittest_util_mac.mm',
         'gfx/image/image_util_unittest.cc',
         'gfx/insets_unittest.cc',
         'gfx/rect_unittest.cc',
         'gfx/render_text_unittest.cc',
         'gfx/screen_unittest.cc',
         'gfx/shadow_value_unittest.cc',
         'gfx/skbitmap_operations_unittest.cc',
         'gfx/skia_util_unittest.cc',
         'gfx/transform_util_unittest.cc',
         'gfx/video_decode_acceleration_support_mac_unittest.mm',
@@ skipping 131 matching lines @@
             'test_suite_name': 'ui_unittests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)ui_unittests<(SHARED_LIB_SUFFIX)',
             'input_jars_paths': ['<(PRODUCT_DIR)/lib.java/chromium_base.jar',],
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }