Stop audio streams in all codepaths that need it.

media/audio/audio_output_controller.h

Index: media/audio/audio_output_controller.h
diff --git a/media/audio/audio_output_controller.h b/media/audio/audio_output_controller.h
index 2c2246bd0d50e883c429e460a87cb0235a060288..bae37734cb0b708be2013e13f0019a0a228d150c 100644
--- a/media/audio/audio_output_controller.h
+++ b/media/audio/audio_output_controller.h
@@ -193,6 +193,9 @@ class MEDIA_EXPORT AudioOutputController
   // Helper method that starts physical stream.
   void StartStream();
 
+  // Helper method that stops, closes, and NULLs |*stream_|.
+  void StopCloseAndClearStream();
+
   // |handler_| may be called only if |state_| is not kClosed.
   EventHandler* handler_;
   AudioOutputStream* stream_;