Avoid hitting the thread check when WebRtcAudioRenderer is going away.

content/renderer/media/media_stream_audio_processor.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_H_
 
 #include "base/atomicops.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
@@ skipping 78 matching lines @@
 
  private:
   friend class MediaStreamAudioProcessorTest;
 
   class MediaStreamAudioConverter;
 
   // WebRtcPlayoutDataSource::Sink implementation.
   virtual void OnPlayoutData(media::AudioBus* audio_bus,
                              int sample_rate,
                              int audio_delay_milliseconds) OVERRIDE;
+  virtual void OnPlayoutDataSourceChanged() OVERRIDE;
 
   // Helper to initialize the WebRtc AudioProcessing.
   void InitializeAudioProcessingModule(
       const blink::WebMediaConstraints& constraints, int effects);
 
   // Helper to initialize the capture converter.
   void InitializeCaptureConverter(const media::AudioParameters& source_params);
 
   // Helper to initialize the render converter.
   void InitializeRenderConverterIfNeeded(int sample_rate,
@@ skipping 54 matching lines @@
   // Used by the typing detection.
   scoped_ptr<webrtc::TypingDetection> typing_detector_;
 
   // Result from the typing detection.
   bool typing_detected_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_H_