Change kEnableAudioTrackProcessing to a disable flag and remove finch code

content/renderer/media/webrtc_local_audio_track.cc

Index: content/renderer/media/webrtc_local_audio_track.cc
diff --git a/content/renderer/media/webrtc_local_audio_track.cc b/content/renderer/media/webrtc_local_audio_track.cc
index 22175f78c9917a4cc34593619f370d2ed073ff9c..95f34f64ea3987469bdacdc08bc7d2dee491d40e 100644
--- a/content/renderer/media/webrtc_local_audio_track.cc
+++ b/content/renderer/media/webrtc_local_audio_track.cc
@@ -113,7 +113,7 @@ void WebRtcLocalAudioTrack::OnSetFormat(
 void WebRtcLocalAudioTrack::SetAudioProcessor(
     const scoped_refptr<MediaStreamAudioProcessor>& processor) {
   // if the |processor| does not have audio processing, which can happen if
-  // kEnableAudioTrackProcessing is not set or all the constraints in
+  // kDisableAudioTrackProcessing is set set or all the constraints in
   // the |processor| are turned off. In such case, we pass NULL to the
   // adapter to indicate that no stats can be gotten from the processor.
   adapter_->SetAudioProcessor(processor->has_audio_processing() ?