Switch Audio Preferences to per device.

chromeos/audio/audio_pref_handler.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 CHROMEOS_AUDIO_AUDIO_PREF_HANDLER_H_
 #define CHROMEOS_AUDIO_AUDIO_PREF_HANDLER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "chromeos/audio/audio_pref_observer.h"
 #include "chromeos/chromeos_export.h"
 
 class PrefRegistrySimple;
 
 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]

Ditto TODO

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

Done.

 // Interface that handles audio preference related work, reads and writes
 // audio preferences, and notifies AudioPrefObserver for audio preference
 // changes.
 class CHROMEOS_EXPORT AudioPrefHandler
     : public base::RefCountedThreadSafe<AudioPrefHandler> {
  public:
   // Gets the audio output volume value from prefs.
   virtual double GetOutputVolumeValue() = 0;
 
   // Sets the output audio volume value to prefs.
@@ skipping 23 matching lines @@
  protected:
   virtual ~AudioPrefHandler() {}
 
  private:
   friend class base::RefCountedThreadSafe<AudioPrefHandler>;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_AUDIO_AUDIO_PREF_HANDLER_H_