Revert 251959 "Refactor the TrayAudio code so that it can be use..."

trunk/src/ash/system/tray/system_tray_notifier.cc

Index: trunk/src/ash/system/tray/system_tray_notifier.cc
===================================================================
--- trunk/src/ash/system/tray/system_tray_notifier.cc	(revision 252005)
+++ trunk/src/ash/system/tray/system_tray_notifier.cc	(working copy)
@@ -29,14 +29,6 @@
   accessibility_observers_.RemoveObserver(observer);
 }
 
-void SystemTrayNotifier::AddAudioObserver(AudioObserver* observer) {
-  audio_observers_.AddObserver(observer);
-}
-
-void SystemTrayNotifier::RemoveAudioObserver(AudioObserver* observer) {
-  audio_observers_.RemoveObserver(observer);
-}
-
 void SystemTrayNotifier::AddBluetoothObserver(BluetoothObserver* observer) {
   bluetooth_observers_.AddObserver(observer);
 }
@@ -178,41 +170,6 @@
       OnAccessibilityModeChanged(notify));
 }
 
-void SystemTrayNotifier::NotifyAudioOutputVolumeChanged() {
-  FOR_EACH_OBSERVER(
-      AudioObserver,
-      audio_observers_,
-      OnOutputVolumeChanged());
-}
-
-void SystemTrayNotifier::NotifyAudioOutputMuteChanged() {
-  FOR_EACH_OBSERVER(
-      AudioObserver,
-      audio_observers_,
-      OnOutputMuteChanged());
-}
-
-void SystemTrayNotifier::NotifyAudioNodesChanged() {
-  FOR_EACH_OBSERVER(
-      AudioObserver,
-      audio_observers_,
-      OnAudioNodesChanged());
-}
-
-void SystemTrayNotifier::NotifyAudioActiveOutputNodeChanged() {
-  FOR_EACH_OBSERVER(
-      AudioObserver,
-      audio_observers_,
-      OnActiveOutputNodeChanged());
-}
-
-void SystemTrayNotifier::NotifyAudioActiveInputNodeChanged() {
-  FOR_EACH_OBSERVER(
-      AudioObserver,
-      audio_observers_,
-      OnActiveInputNodeChanged());
-}
-
 void SystemTrayNotifier::NotifyTracingModeChanged(bool value) {
   FOR_EACH_OBSERVER(
       TracingObserver,