Implements AudioMessageFilter as member in RenderThread

content/renderer/media/audio_input_device.cc

Index: content/renderer/media/audio_input_device.cc
===================================================================
--- content/renderer/media/audio_input_device.cc	(revision 90962)
+++ content/renderer/media/audio_input_device.cc	(working copy)
@@ -133,12 +133,12 @@
 void AudioInputDevice::InitializeOnIOThread(const AudioParameters& params) {
   stream_id_ = filter_->AddDelegate(this);
   filter_->Send(
-      new AudioInputHostMsg_CreateStream(0, stream_id_, params, true));
+      new AudioInputHostMsg_CreateStream(stream_id_, params, true));
 }
 
 void AudioInputDevice::StartOnIOThread() {
   if (stream_id_)
-    filter_->Send(new AudioInputHostMsg_RecordStream(0, stream_id_));
+    filter_->Send(new AudioInputHostMsg_RecordStream(stream_id_));
 }
 
 void AudioInputDevice::ShutDownOnIOThread() {
@@ -146,14 +146,14 @@
   if (!stream_id_)
     return;
 
-  filter_->Send(new AudioInputHostMsg_CloseStream(0, stream_id_));
+  filter_->Send(new AudioInputHostMsg_CloseStream(stream_id_));
   filter_->RemoveDelegate(stream_id_);
   stream_id_ = 0;
 }
 
 void AudioInputDevice::SetVolumeOnIOThread(double volume) {
   if (stream_id_)
-    filter_->Send(new AudioInputHostMsg_SetVolume(0, stream_id_, volume));
+    filter_->Send(new AudioInputHostMsg_SetVolume(stream_id_, volume));
 }
 
 void AudioInputDevice::OnLowLatencyCreated(