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

ash/system/tray/system_tray_notifier.cc

Index: ash/system/tray/system_tray_notifier.cc
diff --git a/ash/system/tray/system_tray_notifier.cc b/ash/system/tray/system_tray_notifier.cc
index b11f2566928dd61a8dabdad50f3a6e64d2876d10..17d6fd276f5c01a97e8591262b2bc3b140b01a04 100644
--- a/ash/system/tray/system_tray_notifier.cc
+++ b/ash/system/tray/system_tray_notifier.cc
@@ -81,12 +81,11 @@ void SystemTrayNotifier::AddSmsObserver(SmsObserver* 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) {