Consolidate volume control code.

ash/system/status_area_widget.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/status_area_widget.h"
 
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
@@ skipping 73 matching lines @@
 
   virtual void ShowDriveSettings() OVERRIDE {
   }
 
   virtual void ShowIMESettings() OVERRIDE {
   }
 
   virtual void ShowHelp() OVERRIDE {
   }
 
-  virtual bool IsAudioMuted() const OVERRIDE {
-    return muted_;
-  }
-
-  virtual void SetAudioMuted(bool muted) OVERRIDE {
-    muted_ = muted;
-  }
-
-  virtual float GetVolumeLevel() const OVERRIDE {
-    return volume_;
-  }
-
-  virtual void SetVolumeLevel(float volume) OVERRIDE {
-    volume_ = volume;
-  }
-
   virtual bool IsCapsLockOn() const OVERRIDE {
     return caps_lock_enabled_;
   }
 
   virtual void SetCapsLockEnabled(bool enabled) OVERRIDE {
     caps_lock_enabled_ = enabled;
   }
 
   virtual void ShutDown() OVERRIDE {}
 
@@ skipping 254 matching lines @@
     return;
   login_status_ = login_status;
   if (system_tray_)
     system_tray_->UpdateAfterLoginStatusChange(login_status);
   if (web_notification_tray_)
     web_notification_tray_->UpdateAfterLoginStatusChange(login_status);
 }
 
 }  // namespace internal
 }  // namespace ash