[chromecast] Delete MediaMessageLoop.

chromecast/media/base/media_message_loop.cc

-// 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.
-
-#include "chromecast/media/base/media_message_loop.h"
-
-#include "base/threading/thread.h"
-
-namespace chromecast {
-namespace media {
-
-// static
-scoped_refptr<base::SingleThreadTaskRunner> MediaMessageLoop::GetTaskRunner() {
-  return GetInstance()->thread_->task_runner();
-}
-
-// static
-MediaMessageLoop* MediaMessageLoop::GetInstance() {
-  return base::Singleton<MediaMessageLoop>::get();
-}
-
-MediaMessageLoop::MediaMessageLoop()
-  : thread_(new base::Thread("CmaThread")) {
-  thread_->Start();
-}
-
-MediaMessageLoop::~MediaMessageLoop() {
-  // This will automatically shutdown the thread.
-}
-
-}  // namespace media
-}  // namespace chromecast