[chromecast] Delete MediaMessageLoop.

chromecast/media/base/media_message_loop.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 CHROMECAST_MEDIA_BASE_MEDIA_MESSAGE_LOOP_H_
-#define CHROMECAST_MEDIA_BASE_MEDIA_MESSAGE_LOOP_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/singleton.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-class Thread;
-}
-
-namespace chromecast {
-namespace media {
-
-// DEPRECATED: This is being deprecated.
-// Get the media task runner from CastContentBrowserClient::GetMediaTaskRunner.
-class MediaMessageLoop {
- public:
-  static scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner();
-
-  static MediaMessageLoop* GetInstance();
-
- private:
-  friend struct base::DefaultSingletonTraits<MediaMessageLoop>;
-
-  MediaMessageLoop();
-  ~MediaMessageLoop();
-
-  std::unique_ptr<base::Thread> thread_;
-
-  DISALLOW_COPY_AND_ASSIGN(MediaMessageLoop);
-};
-
-}  // namespace media
-}  // namespace chromecast
-
-#endif  // CHROMECAST_MEDIA_BASE_MEDIA_MESSAGE_LOOP_H_