Revert of services/ui: Use new gpu::GpuInit to do the GPU initialization.

services/ui/gpu/gpu_main.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 SERVICES_UI_GPU_GPU_MAIN_H_
-#define SERVICES_UI_GPU_GPU_MAIN_H_
-
-#include "gpu/ipc/service/gpu_init.h"
-#include "services/ui/gpu/interfaces/gpu_service_internal.mojom.h"
-
-namespace gpu {
-class GpuMemoryBufferFactory;
-}
-
-namespace ui {
-
-class GpuServiceInternal;
-
-class GpuMain : public gpu::GpuSandboxHelper {
- public:
-  GpuMain();
-  ~GpuMain() override;
-
-  void Add(mojom::GpuServiceInternalRequest request);
-
-  GpuServiceInternal* gpu_service() { return gpu_service_internal_.get(); }
-
- private:
-  // gpu::GpuSandboxHelper:
-  void PreSandboxStartup() override;
-  bool EnsureSandboxInitialized() override;
-
-  std::unique_ptr<GpuServiceInternal> gpu_service_internal_;
-  gpu::GpuInit gpu_init_;
-  std::unique_ptr<gpu::GpuMemoryBufferFactory> gpu_memory_buffer_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(GpuMain);
-};
-
-}  // namespace ui
-
-#endif  // SERVICES_UI_GPU_GPU_MAIN_H_