A11y: Introduce High Contrast Mode and Screen Magnifier to ubar tray.

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"
 
 namespace ash {
 
 SystemTrayNotifier::SystemTrayNotifier() {
 }
@@ skipping 63 matching lines @@
 
 void SystemTrayNotifier::AddVpnObserver(NetworkObserver* observer) {
   vpn_observers_.AddObserver(observer);
 }
 
 void SystemTrayNotifier::AddSmsObserver(SmsObserver* observer) {
   sms_observers_.AddObserver(observer);
 }
 #endif
 
-void SystemTrayNotifier::NotifyAccessibilityModeChanged(
-    bool spoken_feedback_enabled) {
+void SystemTrayNotifier::NotifyAccessibilityModeChanged() {
   FOR_EACH_OBSERVER(
       AccessibilityObserver,
       accessibility_observers_,
-      OnAccessibilityModeChanged(spoken_feedback_enabled));
+      OnAccessibilityModeChanged());
 }
 
 void SystemTrayNotifier::NotifyVolumeChanged(float level) {
   FOR_EACH_OBSERVER(AudioObserver,
                     audio_observers_,
                     OnVolumeChanged(level));
 }
 
 void SystemTrayNotifier::NotifyMuteToggled() {
   FOR_EACH_OBSERVER(AudioObserver,
@@ skipping 134 matching lines @@
 }
 
 void SystemTrayNotifier::NotifyAddSmsMessage(
     const base::DictionaryValue& message) {
   FOR_EACH_OBSERVER(SmsObserver, sms_observers_, AddMessage(message));
 }
 
 #endif  // OS_CHROMEOS
 
 }  // namespace ash