Revert of ozone: gpu: Add plumbing for platform-specific gpu messaging

ui/ozone/gpu/gpu_platform_support_host.h

Index: ui/ozone/gpu/gpu_platform_support_host.h
diff --git a/ui/ozone/gpu/gpu_platform_support_host.h b/ui/ozone/gpu/gpu_platform_support_host.h
deleted file mode 100644
index 7c73fd6d5cc4a97dd4eafc2a1ff0affaa279f45e..0000000000000000000000000000000000000000
--- a/ui/ozone/gpu/gpu_platform_support_host.h
+++ /dev/null
@@ -1,40 +0,0 @@
-// 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_GPU_GPU_PLATFORM_SUPPORT_HOST_H_
-#define UI_OZONE_GPU_GPU_PLATFORM_SUPPORT_HOST_H_
-
-#include "ipc/ipc_listener.h"
-#include "ipc/ipc_sender.h"
-#include "ui/ozone/ozone_export.h"
-
-namespace ui {
-
-// Platform-specific object to support a GPU process host.
-//
-// ChromeOS on bare hardware will do display configuration and cursor
-// movement from the GPU process. This provides a conduit for the
-// messages needed to make this work.
-//
-// Under X11, we don't need any GPU messages for display configuration.
-// That's why there's no real functionality here: it's purely mechanism
-// to support additional messages needed by specific platforms.
-class OZONE_EXPORT GpuPlatformSupportHost : public IPC::Listener {
- public:
-  GpuPlatformSupportHost();
-  virtual ~GpuPlatformSupportHost();
-
-  // Called when the GPU process is spun up & channel established.
-  virtual void OnChannelEstablished(int host_id, IPC::Sender* sender) = 0;
-
-  // Called when the GPU process is destroyed.
-  virtual void OnChannelDestroyed(int host_id) = 0;
-};
-
-// create a stub implementation.
-OZONE_EXPORT GpuPlatformSupportHost* CreateStubGpuPlatformSupportHost();
-
-}  // namespace ui
-
-#endif  // UI_OZONE_GPU_GPU_PLATFORM_SUPPORT_HOST_H_