Make chrome/browser/chromeos/accessibility compile on Athena with use_ash=0

ui/chromeos/ui_chromeos.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': [
     {
@@ skipping 43 matching lines @@
         '../message_center/message_center.gyp:message_center',
         '../views/views.gyp:views',
         '../wm/wm.gyp:wm',
         'ui_chromeos_resources',
         'ui_chromeos_strings',
       ],
       'defines': [
         'UI_CHROMEOS_IMPLEMENTATION',
       ],
       'sources': [
+        'accessibility_types.h',
         'network/network_connect.cc',
         'network/network_connect.h',
         'network/network_icon.cc',
         'network/network_icon.h',
         'network/network_icon_animation.cc',
         'network/network_icon_animation.h',
         'network/network_icon_animation_observer.h',
         'network/network_info.cc',
         'network/network_info.h',
         'network/network_list.cc',
         'network/network_list.h',
         'network/network_list_delegate.h',
         'network/network_state_notifier.cc',
         'network/network_state_notifier.h',
         'touch_exploration_controller.cc',
         'touch_exploration_controller.h',
         'user_activity_power_manager_notifier.cc',
         'user_activity_power_manager_notifier.h',
       ],
     },
   ],
 }