Reland 15721002: Hook up the device selection to the WebAudio live audio

content/renderer/media/webrtc_audio_device_impl.h

Index: content/renderer/media/webrtc_audio_device_impl.h
diff --git a/content/renderer/media/webrtc_audio_device_impl.h b/content/renderer/media/webrtc_audio_device_impl.h
index e740a5954f7f79b1371af772a58018ac7da0f10a..960d0d0d985dc45e4622f9d6fb3f08b2f46eeec4 100644
--- a/content/renderer/media/webrtc_audio_device_impl.h
+++ b/content/renderer/media/webrtc_audio_device_impl.h
@@ -24,13 +24,11 @@
 // webrtc::AudioDeviceModule which makes it possible for a user (e.g. webrtc::
 // VoiceEngine) to register this class as an external AudioDeviceModule (ADM).
 // Then WebRtcAudioDeviceImpl::SetSessionId() needs to be called to set the
-// session id that tells which device to use. The user can either get the
-// session id from the MediaStream or use a value of 1 (AudioInputDeviceManager
-// ::kFakeOpenSessionId), the later will open the default device without going
-// through the MediaStream. The user can then call WebRtcAudioDeviceImpl::
-// StartPlayout() and WebRtcAudioDeviceImpl::StartRecording() from the render
-// process to initiate and start audio rendering and capturing in the browser
-// process. IPC is utilized to set up the media streams.
+// session id that tells which device to use. The user can then call
+// WebRtcAudioDeviceImpl::StartPlayout() and
+// WebRtcAudioDeviceImpl::StartRecording() from the render process to initiate
+// and start audio rendering and capturing in the browser process. IPC is
+// utilized to set up the media streams.
 //
 // Usage example:
 //
@@ -39,7 +37,7 @@
 //   {
 //      scoped_refptr<WebRtcAudioDeviceImpl> external_adm;
 //      external_adm = new WebRtcAudioDeviceImpl();
-//      external_adm->SetSessionId(1);
+//      external_adm->SetSessionId(session_id);
 //      VoiceEngine* voe = VoiceEngine::Create();
 //      VoEBase* base = VoEBase::GetInterface(voe);
 //      base->Init(external_adm);