Avoid hitting the thread check when WebRtcAudioRenderer is going away.

content/renderer/media/media_stream_audio_processor.cc

Index: content/renderer/media/media_stream_audio_processor.cc
diff --git a/content/renderer/media/media_stream_audio_processor.cc b/content/renderer/media/media_stream_audio_processor.cc
index 7ae7d26f6d79b1c596d01b56306bc235a9e7c7ab..07021f9ecd81e4b9d9369f64c45419c5c18b7c6d 100644
--- a/content/renderer/media/media_stream_audio_processor.cc
+++ b/content/renderer/media/media_stream_audio_processor.cc
@@ -211,6 +211,11 @@ void MediaStreamAudioProcessor::OnPlayoutData(media::AudioBus* audio_bus,
     audio_processing_->AnalyzeReverseStream(&render_frame_);
 }
 
+void MediaStreamAudioProcessor::OnPlayoutDataSourceChanged() {
+  render_thread_checker_.DetachFromThread();

[tommi (sloooow) - chröme, 2014/03/04 20:48:39]

add some documentation here that explains what thread we're on and why it's safe
to delete this object without a lock.

[no longer working on chromium, 2014/03/05 13:01:04]

Done, I added a thread check here as well.

+  render_converter_.reset();
+}
+
 void MediaStreamAudioProcessor::GetStats(AudioProcessorStats* stats) {
   stats->typing_noise_detected =
       (base::subtle::Acquire_Load(&typing_detected_) != false);