Consolidate volume control code.

chrome/browser/chromeos/system/ash_system_tray_delegate.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 "chrome/browser/chromeos/system/ash_system_tray_delegate.h"
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/audio/audio_observer.h"
 #include "ash/system/bluetooth/bluetooth_observer.h"
@@ skipping 319 matching lines @@
     content::RecordAction(
         content::UserMetricsAction("OpenLanguageOptionsDialog"));
     chrome::ShowSettingsSubPage(GetAppropriateBrowser(),
                                 chrome::kLanguageOptionsSubPage);
   }
 
   virtual void ShowHelp() OVERRIDE {
     chrome::ShowHelp(GetAppropriateBrowser(), chrome::HELP_SOURCE_MENU);
   }
 
-  virtual bool IsAudioMuted() const OVERRIDE {
-    return AudioHandler::GetInstance()->IsMuted();
-  }
-
-  virtual void SetAudioMuted(bool muted) OVERRIDE {
-    return AudioHandler::GetInstance()->SetMuted(muted);
-  }
-
-  virtual float GetVolumeLevel() const OVERRIDE {
-    return AudioHandler::GetInstance()->GetVolumePercent() / 100.f;
-  }
-
-  virtual void SetVolumeLevel(float level) OVERRIDE {
-    AudioHandler::GetInstance()->SetVolumePercent(level * 100.f);
-  }
-
   virtual bool IsCapsLockOn() const OVERRIDE {
     input_method::InputMethodManager* ime_manager =
         input_method::InputMethodManager::GetInstance();
     return ime_manager->GetXKeyboard()->CapsLockIsEnabled();
   }
 
   virtual void SetCapsLockEnabled(bool enabled) OVERRIDE {
     input_method::InputMethodManager* ime_manager =
         input_method::InputMethodManager::GetInstance();
     return ime_manager->GetXKeyboard()->SetCapsLockEnabled(enabled);
@@ skipping 887 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegate);
 };
 
 }  // namespace
 
 ash::SystemTrayDelegate* CreateSystemTrayDelegate(ash::SystemTray* tray) {
   return new chromeos::SystemTrayDelegate(tray);
 }
 
 }  // namespace chromeos