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

content/common/media/audio_messages.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.
 
 // IPC messages for the audio.
 // Multiply-included message file, hence no include guard.
 
-#include <string>
-
 #include "base/basictypes.h"
 #include "base/shared_memory.h"
 #include "base/sync_socket.h"
 #include "content/common/content_export.h"
 #include "content/common/media/media_param_traits.h"
 #include "ipc/ipc_message_macros.h"
 #include "media/audio/audio_buffers_state.h"
 #include "media/audio/audio_input_ipc.h"
 #include "media/audio/audio_output_ipc.h"
 #include "media/audio/audio_parameters.h"
@@ skipping 58 matching lines @@
 
 // Notification message sent from browser to renderer for state update.
 IPC_MESSAGE_CONTROL2(AudioInputMsg_NotifyStreamStateChanged,
                      int /* stream id */,
                      media::AudioInputIPCDelegate::State /* new state */)
 
 IPC_MESSAGE_CONTROL2(AudioInputMsg_NotifyStreamVolume,
                      int /* stream id */,
                      double /* volume */)
 
-IPC_MESSAGE_CONTROL2(AudioInputMsg_NotifyDeviceStarted,
-                     int /* stream id */,
-                     std::string /* device_id */)
-
 // Messages sent from the renderer to the browser.
 
 // Request that got sent to browser for creating an audio output stream
 IPC_MESSAGE_CONTROL2(AudioHostMsg_CreateStream,
                      int /* stream_id */,
                      media::AudioParameters /* params */)
 
 // Request that got sent to browser for creating an audio input stream
 IPC_MESSAGE_CONTROL4(AudioInputHostMsg_CreateStream,
                      int /* stream_id */,
+                     int /* session_id */,
                      media::AudioParameters /* params */,
-                     std::string /* device_id */,
                      bool /* automatic_gain_control */)
 
 // Indicate that audio for a stream is produced by the specified render view.
 IPC_MESSAGE_CONTROL2(AudioHostMsg_AssociateStreamWithProducer,
                      int /* stream_id */,
                      int /* render_view_id */)
 
 // Indicate that audio for a stream is consumed by the specified render view.
 IPC_MESSAGE_CONTROL2(AudioInputHostMsg_AssociateStreamWithConsumer,
                      int /* stream_id */,
@@ skipping 26 matching lines @@
 // Set audio volume of the stream specified by stream_id.
 // TODO(hclam): change this to vector if we have channel numbers other than 2.
 IPC_MESSAGE_CONTROL2(AudioHostMsg_SetVolume,
                      int /* stream_id */,
                      double /* volume */)
 
 // Set audio volume of the input stream specified by stream_id.
 IPC_MESSAGE_CONTROL2(AudioInputHostMsg_SetVolume,
                      int /* stream_id */,
                      double /* volume */)
-
-// Start the device referenced by the session_id for the input stream specified
-// by stream_id.
-IPC_MESSAGE_CONTROL2(AudioInputHostMsg_StartDevice,
-                     int /* stream_id */,
-                     int /* session_id */)