mash: Move accessibility_types.h from ui namespace to ash namespace

ash/common/system/tray/wm_system_tray_notifier.cc

 // Copyright 2016 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.
 
 #include "ash/common/system/tray/wm_system_tray_notifier.h"
 
 #include "ash/common/system/accessibility_observer.h"
 #include "ash/common/system/date/clock_observer.h"
 #include "ash/common/system/update/update_observer.h"
 
@@ skipping 23 matching lines @@
 
 void WmSystemTrayNotifier::AddUpdateObserver(UpdateObserver* observer) {
   update_observers_.AddObserver(observer);
 }
 
 void WmSystemTrayNotifier::RemoveUpdateObserver(UpdateObserver* observer) {
   update_observers_.RemoveObserver(observer);
 }
 
 void WmSystemTrayNotifier::NotifyAccessibilityModeChanged(
-    ui::AccessibilityNotificationVisibility notify) {
+    AccessibilityNotificationVisibility notify) {
   FOR_EACH_OBSERVER(AccessibilityObserver, accessibility_observers_,
                     OnAccessibilityModeChanged(notify));
 }
 
 void WmSystemTrayNotifier::NotifyRefreshClock() {
   FOR_EACH_OBSERVER(ClockObserver, clock_observers_, Refresh());
 }
 
 void WmSystemTrayNotifier::NotifyDateFormatChanged() {
   FOR_EACH_OBSERVER(ClockObserver, clock_observers_, OnDateFormatChanged());
 }
 
 void WmSystemTrayNotifier::NotifySystemClockTimeUpdated() {
   FOR_EACH_OBSERVER(ClockObserver, clock_observers_,
                     OnSystemClockTimeUpdated());
 }
 
 void WmSystemTrayNotifier::NotifySystemClockCanSetTimeChanged(
     bool can_set_time) {
   FOR_EACH_OBSERVER(ClockObserver, clock_observers_,
                     OnSystemClockCanSetTimeChanged(can_set_time));
 }
 
 void WmSystemTrayNotifier::NotifyUpdateRecommended(const UpdateInfo& info) {
   FOR_EACH_OBSERVER(UpdateObserver, update_observers_,
                     OnUpdateRecommended(info));
 }
 
 }  // namespace ash