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

ash/system/tray/system_tray_notifier.cc

 // 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.
 
 #include "ash/system/tray/system_tray_notifier.h"
 
 #if defined(OS_CHROMEOS)
 #include "ash/system/chromeos/network/network_state_notifier.h"
 #endif
 
@@ skipping 167 matching lines @@
   last_window_closed_observers_.AddObserver(observer);
 }
 
 void SystemTrayNotifier::RemoveLastWindowClosedObserver(
     LastWindowClosedObserver* observer) {
   last_window_closed_observers_.RemoveObserver(observer);
 }
 #endif
 
 void SystemTrayNotifier::NotifyAccessibilityModeChanged(
-    AccessibilityNotificationVisibility notify) {
+    ui::AccessibilityNotificationVisibility notify) {
   FOR_EACH_OBSERVER(
       AccessibilityObserver,
       accessibility_observers_,
       OnAccessibilityModeChanged(notify));
 }
 
 void SystemTrayNotifier::NotifyAudioOutputVolumeChanged() {
   FOR_EACH_OBSERVER(
       AudioObserver,
       audio_observers_,
@@ skipping 179 matching lines @@
 
 void SystemTrayNotifier::NotifyLastWindowClosed() {
   FOR_EACH_OBSERVER(LastWindowClosedObserver,
                     last_window_closed_observers_,
                     OnLastWindowClosed());
 }
 
 #endif  // OS_CHROMEOS
 
 }  // namespace ash