Update Windows UI on system color changes.

ui/views/views.gyp

 # 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.
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'views',
@@ skipping 246 matching lines @@
         'layout/box_layout.h',
         'layout/fill_layout.cc',
         'layout/fill_layout.h',
         'layout/grid_layout.cc',
         'layout/grid_layout.h',
         'layout/layout_constants.h',
         'layout/layout_manager.cc',
         'layout/layout_manager.h',
         'linux_ui/linux_ui.h',
         'linux_ui/linux_ui.cc',
-        'linux_ui/native_theme_change_observer.h',
         'linux_ui/status_icon_linux.h',
         'linux_ui/status_icon_linux.cc',
         'linux_ui/window_button_order_observer.h',
         'metrics.cc',
         'metrics.h',
         'metrics_aura.cc',
         'mouse_constants.h',
         'mouse_watcher.cc',
         'mouse_watcher.h',
         'mouse_watcher_view_host.cc',
@@ skipping 411 matching lines @@
         }],
         ['use_ozone==1', {
           'sources!': [
             'corewm/capture_controller_unittest.cc',
           ],
         }],
       ],
     },  # target_name: views_unittests
   ],
 }