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

content/renderer/media/audio_input_message_filter.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_AUDIO_INPUT_MESSAGE_FILTER_H_
 #define CONTENT_RENDERER_MEDIA_AUDIO_INPUT_MESSAGE_FILTER_H_
 
 #include "base/id_map.h"
 #include "base/shared_memory.h"
 #include "base/sync_socket.h"
@@ skipping 24 matching lines @@
   // Associates |render_view_id| as the destination of audio for a stream.
   void AssociateStreamWithConsumer(int stream_id, int render_view_id);
 
   // Implementation of AudioInputIPC.  All methods must be called on the
   // provided |io_message_loop|.
   virtual int AddDelegate(
       media::AudioInputIPCDelegate* delegate) OVERRIDE;
   virtual void RemoveDelegate(int id) OVERRIDE;
   virtual void CreateStream(
       int stream_id,
+      int session_id,
       const media::AudioParameters& params,
-      const std::string& device_id,
       bool automatic_gain_control,
       uint32 total_segments) OVERRIDE;
-  virtual void StartDevice(int stream_id, int session_id) OVERRIDE;
   virtual void RecordStream(int stream_id) OVERRIDE;
   virtual void CloseStream(int stream_id) OVERRIDE;
   virtual void SetVolume(int stream_id, double volume) OVERRIDE;
 
   scoped_refptr<base::MessageLoopProxy> io_message_loop() const {
     return io_message_loop_;
   }
 
  private:
   virtual ~AudioInputMessageFilter();
@@ skipping 19 matching lines @@
                        uint32 total_segments);
 
   // Notification of volume property of an audio input stream.
   void OnStreamVolume(int stream_id, double volume);
 
   // Received when internal state of browser process' audio input stream has
   // changed.
   void OnStreamStateChanged(int stream_id,
                             media::AudioInputIPCDelegate::State state);
 
-  // Notification of the opened device of an audio session.
-  void OnDeviceStarted(int stream_id, const std::string& device_id);
-
   // A map of stream ids to delegates.
   IDMap<media::AudioInputIPCDelegate> delegates_;
 
   // IPC channel for Send(), must only be accesed on |io_message_loop_|.
   IPC::Channel* channel_;
 
   // The singleton instance for this filter.
   static AudioInputMessageFilter* filter_;
 
   // Message loop on which IPC calls are driven.
   const scoped_refptr<base::MessageLoopProxy> io_message_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioInputMessageFilter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_AUDIO_INPUT_MESSAGE_FILTER_H_