Switch Audio Preferences to per device.

chrome/browser/chromeos/audio/audio_pref_handler_impl.h

 // Copyright (c) 2013 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_PREF_HANDLER_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_PREF_HANDLER_IMPL_H_
 
 #include "base/observer_list.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "chromeos/audio/audio_pref_handler.h"
 
 class PrefRegistrySimple;
 class PrefService;
 
 namespace chromeos {
 
+// NOTE: This class will be removed once we remove the old Audio Handler code.

[Pam (message me for reviews), 2013/05/02 15:11:40]

Please turn this into a TODO, so there's a username associated with the note.

[rkc, 2013/05/02 18:46:09]

Done.

 // Class which implements AudioPrefHandler interface and register audio
 // preferences as well.
 class AudioPrefHandlerImpl : public AudioPrefHandler {
  public:
   explicit AudioPrefHandlerImpl(PrefService* local_state);
 
   // Overriden from AudioPreHandler.
   virtual double GetOutputVolumeValue() OVERRIDE;
   virtual void SetOutputVolumeValue(double volume_percent) OVERRIDE;
   virtual bool GetOutputMuteValue() OVERRIDE;
@@ skipping 21 matching lines @@
   PrefChangeRegistrar pref_change_registrar_;
 
   ObserverList<AudioPrefObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioPrefHandlerImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_PREF_HANDLER_IMPL_H_