Delete dead (and obsolete) display compositor API

services/ui/gpu/display_compositor/display_compositor_impl.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_DISPLAY_COMPOSITOR_DISPLAY_COMPOSITOR_IMPL_H_
-#define SERVICES_UI_GPU_DISPLAY_COMPOSITOR_DISPLAY_COMPOSITOR_IMPL_H_
-
-#include "services/ui/public/interfaces/gpu/display_compositor.mojom.h"
-#include "services/ui/public/interfaces/gpu/display_compositor_host.mojom.h"
-
-namespace ui {
-namespace gpu {
-
-class DisplayCompositorImpl : public mojom::DisplayCompositor {
- public:
-  DisplayCompositorImpl();
-  ~DisplayCompositorImpl() override;
-
-  // mojom::DisplayCompositor implementation.
-  void CreateDisplay(int accelerated_widget,
-                     mojo::InterfaceRequest<mojom::Display> display,
-                     mojom::DisplayHostPtr host,
-                     mojo::InterfaceRequest<mojom::CompositorFrameSink> sink,
-                     mojom::CompositorFrameSinkClientPtr client) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(DisplayCompositorImpl);
-};
-
-}  // namespace gpu
-}  // namespace ui
-
-#endif  // SERVICES_UI_GPU_DISPLAY_COMPOSITOR_DISPLAY_COMPOSITOR_IMPL_H_