AdjustOutputVolumeByPercent   69 chrome/browser/ui/ash/volume_controller_chromeos.cc     audio_handler->AdjustOutputVolumeByPercent(-kStepPercentage);
AdjustOutputVolumeByPercent   90 chrome/browser/ui/ash/volume_controller_chromeos.cc     audio_handler->AdjustOutputVolumeByPercent(kStepPercentage);
AdjustOutputVolumeByPercent  141 chromeos/audio/cras_audio_handler.h   virtual void AdjustOutputVolumeByPercent(int adjust_by_percent);