mash: Migrate tray audio and deps to common.

components/arc/audio/arc_audio_bridge.cc

Index: components/arc/audio/arc_audio_bridge.cc
diff --git a/components/arc/audio/arc_audio_bridge.cc b/components/arc/audio/arc_audio_bridge.cc
index 0e0aee02f47e28cce6f07434856f1b62eeaafe2f..bf5e2b64b07ce2211cbc9ab20b2a884fd35271d5 100644
--- a/components/arc/audio/arc_audio_bridge.cc
+++ b/components/arc/audio/arc_audio_bridge.cc
@@ -4,8 +4,8 @@
 
 #include "components/arc/audio/arc_audio_bridge.h"
 
-#include "ash/shell.h"
-#include "ash/system/tray/system_tray_notifier.h"
+#include "ash/common/system/tray/wm_system_tray_notifier.h"
+#include "ash/common/wm_shell.h"
 #include "base/logging.h"
 #include "chromeos/audio/audio_device.h"
 
@@ -44,7 +44,7 @@ void ArcAudioBridge::OnAudioInstanceReady() {
 
 void ArcAudioBridge::ShowVolumeControls() {
   VLOG(2) << "ArcAudioBridge::ShowVolumeControls";
-  ash::Shell::GetInstance()->system_tray_notifier()->
+  ash::WmShell::Get()->system_tray_notifier()->
       NotifyAudioOutputVolumeChanged(0, 0);
 }