AddAudioPrefObserver   36 chrome/browser/chromeos/audio/audio_devices_pref_handler_impl.h   virtual void AddAudioPrefObserver(AudioPrefObserver* observer) OVERRIDE;
AddAudioPrefObserver   44 chromeos/audio/audio_devices_pref_handler.h   virtual void AddAudioPrefObserver(AudioPrefObserver* observer) = 0;
AddAudioPrefObserver   33 chromeos/audio/audio_devices_pref_handler_stub.h   virtual void AddAudioPrefObserver(AudioPrefObserver* observer) OVERRIDE;
AddAudioPrefObserver  328 chromeos/audio/cras_audio_handler.cc   audio_pref_handler_->AddAudioPrefObserver(this);