Clean up the media stream audio track code

content/renderer/media/media_stream_audio_processor.h

Index: content/renderer/media/media_stream_audio_processor.h
diff --git a/content/renderer/media/media_stream_audio_processor.h b/content/renderer/media/media_stream_audio_processor.h
index 0209bd6ae2177d5e09dc6e2dad84e39b9473d049..d5764ff414b7359179610d151001f1dac1163c00 100644
--- a/content/renderer/media/media_stream_audio_processor.h
+++ b/content/renderer/media/media_stream_audio_processor.h
@@ -50,10 +50,6 @@ class CONTENT_EXPORT MediaStreamAudioProcessor :
     NON_EXPORTED_BASE(public AudioProcessorInterface),
     NON_EXPORTED_BASE(public AecDumpMessageFilter::AecDumpDelegate) {
  public:
-  // Returns false if |kDisableAudioTrackProcessing| is set to true, otherwise
-  // returns true.
-  static bool IsAudioTrackProcessingEnabled();
-
   // |playout_data_source| is used to register this class as a sink to the
   // WebRtc playout data for processing AEC. If clients do not enable AEC,
   // |playout_data_source| won't be used.