GetOutputDefaultVolumeMuteLevel   20 ash/system/chromeos/audio/tray_audio_delegate_chromeos.cc int TrayAudioDelegateChromeOs::GetOutputDefaultVolumeMuteLevel() {
GetOutputDefaultVolumeMuteLevel   34 ash/system/win/audio/tray_audio_delegate_win.cc int TrayAudioDelegateWin::GetOutputDefaultVolumeMuteLevel() {