Do not pass the string device_id via IPC message to create an audio input stream

content/renderer/media/webrtc_audio_device_impl.h

 // Copyright (c) 2012 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_WEBRTC_AUDIO_DEVICE_IMPL_H_
 #define CONTENT_RENDERER_MEDIA_WEBRTC_AUDIO_DEVICE_IMPL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 194 matching lines @@
   // Callback to deliver the captured interleaved data.
   virtual void CaptureData(const int16* audio_data,
                            int number_of_channels,
                            int number_of_frames,
                            int audio_delay_milliseconds,
                            double volume) = 0;
 
   // Set the format for the capture audio parameters.
   virtual void SetCaptureFormat(const media::AudioParameters& params) = 0;
 
-  // Callback to notify the client that the capturer is being stopped.
-  virtual void OnCaptureDeviceStopped() = 0;
-
  protected:
   virtual ~WebRtcAudioCapturerSink() {}
 };
 
 class CONTENT_EXPORT WebRtcAudioDeviceImpl
     : NON_EXPORTED_BASE(public webrtc::AudioDeviceModule),
       NON_EXPORTED_BASE(public WebRtcAudioCapturerSink),
       NON_EXPORTED_BASE(public WebRtcAudioRendererSource) {
  public:
   // Methods called on main render thread.
@@ skipping 13 matching lines @@
   virtual void SetRenderFormat(const media::AudioParameters& params) OVERRIDE;
   virtual void RemoveRenderer(WebRtcAudioRenderer* renderer) OVERRIDE;
 
   // WebRtcAudioCapturerSink implementation.
   virtual void CaptureData(const int16* audio_data,
                            int number_of_channels,
                            int number_of_frames,
                            int audio_delay_milliseconds,
                            double volume) OVERRIDE;
   virtual void SetCaptureFormat(const media::AudioParameters& params) OVERRIDE;
-  virtual void OnCaptureDeviceStopped() OVERRIDE;
 
   // webrtc::Module implementation.
   virtual int32_t ChangeUniqueId(const int32_t id) OVERRIDE;
   virtual int32_t TimeUntilNextProcess() OVERRIDE;
   virtual int32_t Process() OVERRIDE;
 
   // webrtc::AudioDeviceModule implementation.
   virtual int32_t ActiveAudioLayer(AudioLayer* audio_layer) const OVERRIDE;
   virtual ErrorCode LastError() const OVERRIDE;
 
@@ skipping 194 matching lines @@
   // Used for histograms of total recording and playout times.
   base::Time start_capture_time_;
   base::Time start_render_time_;
 
   DISALLOW_COPY_AND_ASSIGN(WebRtcAudioDeviceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBRTC_AUDIO_DEVICE_IMPL_H_