Revert of Reland: MediaCaptureFromElement: add support for audio captureStream().

content/renderer/media/html_audio_element_capturer_source.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 CONTENT_RENDERER_MEDIA_HTML_AUDIO_ELEMENT_CAPTURER_SOURCE_H_
-#define CONTENT_RENDERER_MEDIA_HTML_AUDIO_ELEMENT_CAPTURER_SOURCE_H_
-
-#include "base/callback.h"
-#include "base/memory/weak_ptr.h"
-#include "base/threading/thread_checker.h"
-#include "content/common/content_export.h"
-#include "content/renderer/media/media_stream_audio_source.h"
-
-namespace blink {
-class WebMediaPlayer;
-}  // namespace blink
-
-namespace media {
-class AudioBus;
-class WebAudioSourceProviderImpl;
-}  // namespace media
-
-namespace content {
-
-// This class is a MediaStreamAudioSource that registers to the constructor-
-// passed weak WebAudioSourceProviderImpl to receive a copy of the audio data
-// intended for rendering. This copied data is received on OnAudioBus() and sent
-// to all the registered Tracks.
-class CONTENT_EXPORT HtmlAudioElementCapturerSource final
-    : NON_EXPORTED_BASE(public MediaStreamAudioSource) {
- public:
-  static HtmlAudioElementCapturerSource*
-  CreateFromWebMediaPlayerImpl(blink::WebMediaPlayer* player);
-
-  explicit HtmlAudioElementCapturerSource(
-      media::WebAudioSourceProviderImpl* audio_source);
-  ~HtmlAudioElementCapturerSource() override;
-
- private:
-  // MediaStreamAudioSource implementation.
-  bool EnsureSourceIsStarted() final;
-  void EnsureSourceIsStopped() final;
-
-  // To act as an WebAudioSourceProviderImpl::CopyAudioCB.
-  void OnAudioBus(std::unique_ptr<media::AudioBus> audio_bus,
-                  uint32_t delay_milliseconds,
-                  int sample_rate);
-
-  scoped_refptr<media::WebAudioSourceProviderImpl> audio_source_;
-
-  bool is_started_;
-  int last_sample_rate_;
-  int last_num_channels_;
-  int last_bus_frames_;
-
-  base::ThreadChecker thread_checker_;
-
-  DISALLOW_COPY_AND_ASSIGN(HtmlAudioElementCapturerSource);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_MEDIA_HTML_AUDIO_ELEMENT_CAPTURER_SOURCE_H_