Revert 251959 "Refactor the TrayAudio code so that it can be use..."

trunk/src/chromeos/audio/cras_audio_handler.cc

Index: trunk/src/chromeos/audio/cras_audio_handler.cc
===================================================================
--- trunk/src/chromeos/audio/cras_audio_handler.cc	(revision 252005)
+++ trunk/src/chromeos/audio/cras_audio_handler.cc	(working copy)
@@ -130,10 +130,6 @@
   return audio_pref_handler_->GetMuteValue(*device);
 }
 
-int CrasAudioHandler::GetOutputDefaultVolumeMuteThreshold() {
-  return kMuteThresholdPercent;
-}
-
 int CrasAudioHandler::GetOutputVolumePercent() {
   return output_volume_;
 }