Revert "Implement GpuArcVideoService for arc video accelerator"

content/browser/gpu/gpu_arc_video_service_host.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_BROWSER_GPU_GPU_ARC_VIDEO_SERVICE_HOST_H_
-#define CONTENT_BROWSER_GPU_GPU_ARC_VIDEO_SERVICE_HOST_H_
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/threading/thread_checker.h"
-#include "components/arc/video/video_host_delegate.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-}
-
-namespace IPC {
-struct ChannelHandle;
-}
-
-namespace content {
-
-// This class passes requests from arc::VideoInstance to GpuArcVideoService to
-// create a video accelerator channel in GPU process and reply the created
-// channel.
-//
-// Don't be confused two senses of "host" of this class. This class, which
-// implements arc::VideoHost, handles requests from arc::VideoInstance. At the
-// same time, as its name says, this class is the host of corresponding class,
-// GpuArcVideoService, in the GPU process.
-class GpuArcVideoServiceHost : public arc::VideoHostDelegate {
- public:
-  GpuArcVideoServiceHost();
-  ~GpuArcVideoServiceHost() override;
-
-  // arc::VideoHostDelegate implementation.
-  void OnStopping() override;
-
-  // arc::VideoHost implementation.
-  void OnRequestArcVideoAcceleratorChannel(
-      const OnRequestArcVideoAcceleratorChannelCallback& callback) override;
-
- private:
-  base::ThreadChecker thread_checker_;
-
-  // IO task runner, where GpuProcessHost tasks run.
-  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
-
-  DISALLOW_COPY_AND_ASSIGN(GpuArcVideoServiceHost);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_GPU_GPU_ARC_VIDEO_SERVICE_HOST_H_