Bug 1208373 - End received audio tracks on closing of PeerConnection. r=jesup

MozReview-Commit-ID: 860jvDzHPhV

--HG--
extra : rebase_source : 51373373e320174fcf898b435fdce249e2351560
extra : source : ec1e6e9e48a26d73e29b6ba772f734b3525f52a1

media/webrtc/signaling/src/mediapipeline/MediaPipeline.cpp

@@ -2080,6 +2080,8 @@ MediaPipelineReceiveAudio::MediaPipelineReceiveAudio(
 void MediaPipelineReceiveAudio::DetachMedia()
 {
   ASSERT_ON_THREAD(main_thread_);
+
+  listener_->EndTrack();
   if (stream_) {
     stream_->RemoveListener(listener_);
     stream_ = nullptr;