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

content/renderer/media/media_stream_audio_sink_owner.h

Index: content/renderer/media/media_stream_audio_sink_owner.h
diff --git a/content/renderer/media/media_stream_audio_sink_owner.h b/content/renderer/media/media_stream_audio_sink_owner.h
new file mode 100644
index 0000000000000000000000000000000000000000..1cc98b994c2d3bc6b858fbf090435c310b5303c3
--- /dev/null
+++ b/content/renderer/media/media_stream_audio_sink_owner.h
@@ -0,0 +1,47 @@
+// Copyright 2013 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_MEDIA_STREAM_AUDIO_SINK_OWNER_H_
+#define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_SINK_OWNER_H_
+
+#include <vector>
+
+#include "base/macros.h"
+#include "base/synchronization/lock.h"
+#include "content/renderer/media/media_stream_audio_track_sink.h"
+
+namespace content {
+
+class MediaStreamAudioSink;
+
+// Reference counted holder of MediaStreamAudioSink sinks.
+class MediaStreamAudioSinkOwner : public MediaStreamAudioTrackSink {
+ public:
+  explicit MediaStreamAudioSinkOwner(MediaStreamAudioSink* sink);
+
+  // MediaStreamAudioTrackSink implementation.
+  void OnData(const media::AudioBus& audio_bus,
+              base::TimeTicks estimated_capture_time) override;
+  void OnSetFormat(const media::AudioParameters& params) override;
+  void OnReadyStateChanged(
+      blink::WebMediaStreamSource::ReadyState state) override;
+  void Reset() override;
+  bool IsEqual(const MediaStreamAudioSink* other) const override;
+
+ protected:
+  ~MediaStreamAudioSinkOwner() override {}
+
+ private:
+  mutable base::Lock lock_;
+
+  // Raw pointer to the delegate, the client need to call Reset() to set the
+  // pointer to NULL before the delegate goes away.
+  MediaStreamAudioSink* delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaStreamAudioSinkOwner);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_SINK_OWNER_H_