Stop media stream source when audio capture error occurs.

content/renderer/media/local_media_stream_audio_source.h

Index: content/renderer/media/local_media_stream_audio_source.h
diff --git a/content/renderer/media/local_media_stream_audio_source.h b/content/renderer/media/local_media_stream_audio_source.h
index 1d9d63a0e8d2043c38333e6e5d5a6a077f634cfe..6de39732710bfcf5f5647f8c008a89b399a3e5d2 100644
--- a/content/renderer/media/local_media_stream_audio_source.h
+++ b/content/renderer/media/local_media_stream_audio_source.h
@@ -8,6 +8,10 @@
 #include "content/renderer/media/media_stream_audio_source.h"
 #include "media/base/audio_capturer_source.h"
 
+namespace base {
+class SingleThreadTaskRunner;
+}
+
 namespace content {
 
 // Represents a local source of audio data generated by an AudioInputDevice.
@@ -17,7 +21,8 @@ namespace content {
 // (i.e., there is no audio processing).
 class CONTENT_EXPORT LocalMediaStreamAudioSource
     : NON_EXPORTED_BASE(public MediaStreamAudioSource),
-      NON_EXPORTED_BASE(public media::AudioCapturerSource::CaptureCallback) {
+      NON_EXPORTED_BASE(public media::AudioCapturerSource::CaptureCallback),
+      public base::SupportsWeakPtr<LocalMediaStreamAudioSource> {
  public:
   // |consumer_render_frame_id| references the RenderFrame that will consume the
   // audio data. Audio parameters and (optionally) a pre-existing audio session
@@ -50,6 +55,8 @@ class CONTENT_EXPORT LocalMediaStreamAudioSource
   // or data flow changes are being called on the main thread.
   base::ThreadChecker thread_checker_;
 
+  const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+
   DISALLOW_COPY_AND_ASSIGN(LocalMediaStreamAudioSource);
 };