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

content/renderer/media/media_stream_audio_sink_owner.cc

+// 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.
+
+#include "content/renderer/media/media_stream_audio_sink_owner.h"
+
+#include "content/public/renderer/media_stream_audio_sink.h"
+#include "media/base/audio_parameters.h"
+
+namespace content {
+
+MediaStreamAudioSinkOwner::MediaStreamAudioSinkOwner(MediaStreamAudioSink* sink)
+    : delegate_(sink) {
+}
+
+void MediaStreamAudioSinkOwner::OnData(const media::AudioBus& audio_bus,
+                                       base::TimeTicks estimated_capture_time) {
+  base::AutoLock lock(lock_);
+  if (delegate_)
+    delegate_->OnData(audio_bus, estimated_capture_time);
+}
+
+void MediaStreamAudioSinkOwner::OnSetFormat(
+    const media::AudioParameters& params) {
+  base::AutoLock lock(lock_);
+  if (delegate_)
+    delegate_->OnSetFormat(params);
+}
+
+void MediaStreamAudioSinkOwner::OnReadyStateChanged(
+    blink::WebMediaStreamSource::ReadyState state) {
+  base::AutoLock lock(lock_);
+  if (delegate_)
+    delegate_->OnReadyStateChanged(state);
+}
+
+void MediaStreamAudioSinkOwner::Reset() {
+  base::AutoLock lock(lock_);
+  delegate_ = NULL;
+}
+
+bool MediaStreamAudioSinkOwner::IsEqual(
+    const MediaStreamAudioSink* other) const {
+  DCHECK(other);
+  base::AutoLock lock(lock_);
+  return (other == delegate_);
+}
+
+}  // namespace content