MediaStream audio object graph untangling and clean-ups.

content/renderer/media/webrtc_audio_renderer.cc

Index: content/renderer/media/webrtc_audio_renderer.cc
diff --git a/content/renderer/media/webrtc_audio_renderer.cc b/content/renderer/media/webrtc_audio_renderer.cc
index 8deb7b596516239382f27effb570804dffc05133..39d71b48815704b90242767e20f4aca5d8e8f1fe 100644
--- a/content/renderer/media/webrtc_audio_renderer.cc
+++ b/content/renderer/media/webrtc_audio_renderer.cc
@@ -601,7 +601,7 @@ void WebRtcAudioRenderer::OnPlayStateChanged(
   media_stream.audioTracks(web_tracks);
 
   for (const blink::WebMediaStreamTrack& web_track : web_tracks) {
-    MediaStreamAudioTrack* track = MediaStreamAudioTrack::GetTrack(web_track);
+    MediaStreamAudioTrack* track = MediaStreamAudioTrack::From(web_track);
     // WebRtcAudioRenderer can only render audio tracks received from a remote
     // peer. Since the actual MediaStream is mutable from JavaScript, we need
     // to make sure |web_track| is actually a remote track.