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

content/renderer/media/mock_audio_device_factory.cc

-// 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.
-
-#include "content/renderer/media/mock_audio_device_factory.h"
-
-namespace content {
-
-MockCapturerSource::MockCapturerSource() {}
-
-MockCapturerSource::~MockCapturerSource() {}
-
-void MockCapturerSource::SetVolume(double volume) {}
-
-MockAudioDeviceFactory::MockAudioDeviceFactory()
-    : AudioDeviceFactory(), mock_capturer_source_(new MockCapturerSource()),
-      did_create_once_(false) {}
-
-MockAudioDeviceFactory::~MockAudioDeviceFactory() {}
-
-scoped_refptr<media::AudioCapturerSource>
-MockAudioDeviceFactory::CreateAudioCapturerSource(int render_frame_id) {
-  CHECK(!did_create_once_);
-  did_create_once_ = true;
-  return scoped_refptr<media::AudioCapturerSource>(mock_capturer_source_);
-}
-
-}  // namespace content