Stop source and fire MediaStreamTrack ended event if missing audio input callbacks are detected.

content/renderer/media/local_media_stream_audio_source.cc

Index: content/renderer/media/local_media_stream_audio_source.cc
diff --git a/content/renderer/media/local_media_stream_audio_source.cc b/content/renderer/media/local_media_stream_audio_source.cc
index 5e56aa357dd37e2e4d7c445ee58a23ad5451d482..522d82419dbe68250e74e3ed302f057dfd8ad813 100644
--- a/content/renderer/media/local_media_stream_audio_source.cc
+++ b/content/renderer/media/local_media_stream_audio_source.cc
@@ -6,6 +6,7 @@
 
 #include "content/common/media/media_stream_options.h"
 #include "content/renderer/media/audio_device_factory.h"
+#include "content/renderer/media/webrtc_logging.h"
 #include "content/renderer/render_frame_impl.h"
 
 namespace content {
@@ -105,6 +106,7 @@ void LocalMediaStreamAudioSource::Capture(const media::AudioBus* audio_bus,
 }
 
 void LocalMediaStreamAudioSource::OnCaptureError(const std::string& why) {
+  WebRtcLogMessage("LocalMediaStreamAudioSource::OnCaptureError: " + why);
   StopSourceOnError(why);
 }