Add Audio support in Chromoting host when using WebRTC.

remoting/protocol/audio_stream.h

 // Copyright 2016 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 REMOTING_PROTOCOL_audio_stream_H_
-#define REMOTING_PROTOCOL_audio_stream_H_
+#ifndef REMOTING_PROTOCOL_AUDIO_STREAM_H_
+#define REMOTING_PROTOCOL_AUDIO_STREAM_H_
 
 namespace remoting {
 namespace protocol {
 
 // AudioStream is responsible for fetching audio data from an AudioSource,
 // and sending it to the client.
 class AudioStream {
  public:
   AudioStream() {}
   virtual ~AudioStream() {}
 
   // Pauses or resumes audio on a running session. This leaves the audio
   // capturer running, and only affects whether or not the captured audio is
   // encoded and sent on the wire.
   virtual void Pause(bool pause) = 0;
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
-#endif  // REMOTING_PROTOCOL_audio_stream_H_
+#endif  // REMOTING_PROTOCOL_AUDIO_STREAM_H_