Remove GPU relinquish resources infrastructure and stop GPU process.

ui/ozone/public/gpu_platform_support.h

 // 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.
 
 #ifndef UI_OZONE_PUBLIC_GPU_PLATFORM_SUPPORT_H_
 #define UI_OZONE_PUBLIC_GPU_PLATFORM_SUPPORT_H_
 
-#include "base/callback.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "ui/ozone/ozone_base_export.h"
 
 namespace IPC {
 class MessageFilter;
 }
 
 namespace ui {
 
 // Platform-specific object to support a GPU process.
 //
 // See GpuPlatformSupportHost for more context.
 class OZONE_BASE_EXPORT GpuPlatformSupport : public IPC::Listener {
  public:
   GpuPlatformSupport();
   ~GpuPlatformSupport() override;
 
   // Called when the GPU process is spun up & channel established.
   virtual void OnChannelEstablished(IPC::Sender* sender) = 0;
 
-  virtual void RelinquishGpuResources(const base::Closure& callback) = 0;
-
   virtual IPC::MessageFilter* GetMessageFilter() = 0;
 };
 
 // Create a stub implementation.
 OZONE_BASE_EXPORT GpuPlatformSupport* CreateStubGpuPlatformSupport();
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PUBLIC_GPU_PLATFORM_SUPPORT_H_