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

ui/gfx/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 176 matching lines @@
     "sequential_id_generator.cc",
     "sequential_id_generator.h",
     "shadow_value.cc",
     "shadow_value.h",
     "skbitmap_operations.cc",
     "skbitmap_operations.h",
     "skia_util.cc",
     "skia_util.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",
     "transform.cc",
     "transform.h",
     "transform_util.cc",
@@ skipping 315 matching lines @@
     sources += [ "chromeos/codec/jpeg_codec_robust_slow_unittest.cc" ]
   }
 
   if (is_win) {
     sources += [
       "font_fallback_win_unittest.cc",
       "icon_util_unittest.cc",
       "icon_util_unittests.rc",
       "path_win_unittest.cc",
       "platform_font_win_unittest.cc",
+      "sys_color_change_listener.cc",
+      "sys_color_change_listener.h",
     ]
 
     ldflags = [
       "/DELAYLOAD:d2d1.dll",
       "/DELAYLOAD:d3d10_1.dll",
     ]
 
     libs = [
       "d2d1.lib",
       "d3d10_1.lib",
       "imm32.lib",
       "oleacc.lib",
     ]
   }
 }
 
 if (is_android) {
   generate_jni("gfx_jni_headers") {
     sources = [
       "../android/java/src/org/chromium/ui/gfx/BitmapHelper.java",
       "../android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java",
       "../android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java",
     ]
     jni_package = "gfx"
   }
 }