[Chromecast] Upgrade to new CMA backend API

chromecast/media/cma/pipeline/media_component_device_client_impl.cc

-// Copyright 2015 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/cma/pipeline/media_component_device_client_impl.h"
-
-#include "base/bind.h"
-#include "base/location.h"
-#include "base/single_thread_task_runner.h"
-#include "base/thread_task_runner_handle.h"
-
-namespace chromecast {
-namespace media {
-
-MediaComponentDeviceClientImpl::MediaComponentDeviceClientImpl(
-    const base::Closure& eos_cb)
-    : eos_cb_(eos_cb), task_runner_(base::ThreadTaskRunnerHandle::Get()) {}
-
-MediaComponentDeviceClientImpl::~MediaComponentDeviceClientImpl() {}
-
-void MediaComponentDeviceClientImpl::OnEndOfStream() {
-  if (task_runner_->BelongsToCurrentThread()) {
-    if (!eos_cb_.is_null())
-      eos_cb_.Run();
-  } else {
-    task_runner_->PostTask(FROM_HERE, eos_cb_);
-  }
-}
-
-}  // namespace media
-}  // namespace chromecast