Revert "Implement GpuArcVideoService for arc video accelerator"

content/common/gpu/media/gpu_arc_video_service.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_COMMON_GPU_MEDIA_GPU_ARC_VIDEO_SERVICE_H_
-#define CONTENT_COMMON_GPU_MEDIA_GPU_ARC_VIDEO_SERVICE_H_
-
-#include <map>
-
-#include "base/callback.h"
-#include "base/threading/thread_checker.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-class WaitableEvent;
-}
-
-namespace IPC {
-struct ChannelHandle;
-}
-
-namespace content {
-
-// GpuArcVideoService manages life-cycle and IPC message translation for
-// ArcVideoAccelerator.
-//
-// For each creation request from GpuChannelManager, GpuArcVideoService will
-// create a new IPC channel.
-class GpuArcVideoService {
- public:
-  class AcceleratorStub;
-  using CreateChannelCallback = base::Callback<void(const IPC::ChannelHandle&)>;
-
-  // |shutdown_event| should signal an event when this process is about to be
-  // shut down in order to notify our new IPC channel to terminate.
-  GpuArcVideoService(
-      base::WaitableEvent* shutdown_event,
-      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
-
-  // Upon deletion, all ArcVideoAccelerator will be deleted and the associated
-  // IPC channels are closed.
-  ~GpuArcVideoService();
-
-  // Creates a new accelerator stub. The creation result will be sent back via
-  // |callback|.
-  void CreateChannel(const CreateChannelCallback& callback);
-
-  // Removes the reference of |stub| (and trigger deletion) from this class.
-  void RemoveClient(AcceleratorStub* stub);
-
- private:
-  base::ThreadChecker thread_checker_;
-
-  // Shutdown event of GPU process.
-  base::WaitableEvent* shutdown_event_;
-
-  // GPU io thread task runner.
-  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
-
-  // Bookkeeping all accelerator stubs.
-  std::map<AcceleratorStub*, scoped_ptr<AcceleratorStub>> accelerator_stubs_;
-
-  DISALLOW_COPY_AND_ASSIGN(GpuArcVideoService);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_GPU_MEDIA_GPU_ARC_VIDEO_SERVICE_H_