Change audio render thread checking to use new AudioRendererSink::BelongsToRendererThread()

media/audio/null_audio_sink.cc

Index: media/audio/null_audio_sink.cc
diff --git a/media/audio/null_audio_sink.cc b/media/audio/null_audio_sink.cc
index 6d40c93e2b67a28a71aaf7840977a6258408972f..f1944f890efeeca0ea63feb8546e5d4aed997f2a 100644
--- a/media/audio/null_audio_sink.cc
+++ b/media/audio/null_audio_sink.cc
@@ -79,6 +79,11 @@ OutputDeviceInfo NullAudioSink::GetOutputDeviceInfo() {
   return OutputDeviceInfo();
 }
 
+bool NullAudioSink::BelongsToRenderingThread() {
+  NOTIMPLEMENTED();

[DaleCurtis, 2016/06/10 18:24:49]

This is used in production, so I think you want to return
message_loop_->BelongsToCurrentThread().

[Henrik Grunell, 2016/06/13 12:46:15]

Done.

+  return false;
+}
+
 void NullAudioSink::SwitchOutputDevice(const std::string& device_id,
                                        const url::Origin& security_origin,
                                        const OutputDeviceStatusCB& callback) {