Stop media stream source when audio capture error occurs.

content/renderer/media/webrtc/processed_local_audio_source_unittest.cc

Index: content/renderer/media/webrtc/processed_local_audio_source_unittest.cc
diff --git a/content/renderer/media/webrtc/processed_local_audio_source_unittest.cc b/content/renderer/media/webrtc/processed_local_audio_source_unittest.cc
index b8ed6009020a5a6964475d5f2876cc963ddebf22..48936e6c12675ad20eccb6f1e14c3e74c3496af1 100644
--- a/content/renderer/media/webrtc/processed_local_audio_source_unittest.cc
+++ b/content/renderer/media/webrtc/processed_local_audio_source_unittest.cc
@@ -6,6 +6,7 @@
 #include <string>
 
 #include "base/logging.h"
+#include "base/message_loop/message_loop.h"
 #include "build/build_config.h"
 #include "content/public/renderer/media_stream_audio_sink.h"
 #include "content/renderer/media/media_stream_audio_track.h"
@@ -141,6 +142,7 @@ class ProcessedLocalAudioSourceTest : public testing::Test {
   MockPeerConnectionDependencyFactory mock_dependency_factory_;
   blink::WebMediaStreamSource blink_audio_source_;
   blink::WebMediaStreamTrack blink_audio_track_;
+  base::MessageLoop message_loop_;
 };
 
 // Tests a basic end-to-end start-up, track+sink connections, audio flow, and