Make SysColorChangeListener Windows-only instead of having an empty shell.

ui/gfx/gfx.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': [
     {
@@ skipping 262 matching lines @@
         'sequential_id_generator.h',
         'shadow_value.cc',
         'shadow_value.h',
         'skbitmap_operations.cc',
         'skbitmap_operations.h',
         'skia_util.cc',
         'skia_util.h',
         'swap_result.h',
         'switches.cc',
         'switches.h',
-        'sys_color_change_listener.cc',
-        'sys_color_change_listener.h',
         'text_constants.h',
         'text_elider.cc',
         'text_elider.h',
         'text_utils.cc',
         'text_utils.h',
         'text_utils_android.cc',
         'text_utils_ios.mm',
         'text_utils_skia.cc',
         'transform.cc',
         'transform.h',
@@ skipping 45 matching lines @@
           'sources!': [
             'canvas_skia.cc',
           ],
         }],
         ['OS=="win"', {
           'sources': [
             'gdi_util.cc',
             'gdi_util.h',
             'icon_util.cc',
             'icon_util.h',
+            'sys_color_change_listener.cc',
+            'sys_color_change_listener.h',
           ],
           # TODO(jschuh): C4267: http://crbug.com/167187 size_t -> int
           # C4324 is structure was padded due to __declspec(align()), which is
           # uninteresting.
           'msvs_disabled_warnings': [ 4267, 4324 ],
         }],
         ['OS=="android"', {
           'sources!': [
             'animation/throb_animation.cc',
             'selection_model.cc',
@@ skipping 129 matching lines @@
          ],
          'variables': {
            'jni_gen_package': 'ui/gfx',
          },
          'includes': [ '../../build/jni_generator.gypi' ],
        },
      ],
     }],
   ],
 }