MediaStream audio: Refactor 3 separate "glue" implementations into one.

content/renderer/media/webrtc/webrtc_audio_sink_adapter.h

-// Copyright 2014 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 CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_AUDIO_SINK_ADAPTER_H_
-#define CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_AUDIO_SINK_ADAPTER_H_
-
-#include <stdint.h>
-
-#include <memory>
-
-#include "base/macros.h"
-#include "content/public/renderer/media_stream_audio_sink.h"
-#include "media/base/audio_parameters.h"
-
-namespace webrtc {
-class AudioTrackSinkInterface;
-}  // namespace webrtc
-
-namespace content {
-
-// Adapter to the webrtc::AudioTrackSinkInterface of the audio track.
-// This class is used in between the MediaStreamAudioSink and
-// webrtc::AudioTrackSinkInterface. It gets data callback via the
-// MediaStreamAudioSink::OnData() interface and pass the data to
-// webrtc::AudioTrackSinkInterface.
-class WebRtcAudioSinkAdapter : public MediaStreamAudioSink {
- public:
-  explicit WebRtcAudioSinkAdapter(
-      webrtc::AudioTrackSinkInterface* sink);
-  ~WebRtcAudioSinkAdapter() override;
-
-  bool IsEqual(const webrtc::AudioTrackSinkInterface* other) const;
-
- private:
-  // MediaStreamAudioSink implementation.
-  void OnData(const media::AudioBus& audio_bus,
-              base::TimeTicks estimated_capture_time) override;
-  void OnSetFormat(const media::AudioParameters& params) override;
-
-  webrtc::AudioTrackSinkInterface* const sink_;
-
-  media::AudioParameters params_;
-  std::unique_ptr<int16_t[]> interleaved_data_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebRtcAudioSinkAdapter);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_AUDIO_SINK_ADAPTER_H_