Move webrtc/audio/audio_sink.h to webrtc/ and fix some dependencies.

webrtc/audio_sink.h

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_AUDIO_AUDIO_SINK_H_
-#define WEBRTC_AUDIO_AUDIO_SINK_H_
+#ifndef WEBRTC_AUDIO_SINK_H_
+#define WEBRTC_AUDIO_SINK_H_
 
 #if defined(WEBRTC_POSIX) && !defined(__STDC_FORMAT_MACROS)
 // Avoid conflict with format_macros.h.
 #define __STDC_FORMAT_MACROS
 #endif
 
 #include <inttypes.h>
 #include <stddef.h>
 
 namespace webrtc {
@@ skipping 20 matching lines @@
     int sample_rate;             // Sample rate in Hz.
     size_t channels;             // Number of channels in the audio data.
     uint32_t timestamp;          // The RTP timestamp of the first sample.
   };
 
   virtual void OnData(const Data& audio) = 0;
 };
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_AUDIO_AUDIO_SINK_H_
+#endif  // WEBRTC_AUDIO_SINK_H_