Revert of Implement a runtime headless mode for Linux

headless/lib/browser/headless_window_tree_host.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 HEADLESS_LIB_BROWSER_HEADLESS_WINDOW_TREE_HOST_H_
-#define HEADLESS_LIB_BROWSER_HEADLESS_WINDOW_TREE_HOST_H_
-
-#include "base/macros.h"
-#include "ui/aura/window_tree_host.h"
-#include "ui/events/platform/platform_event_dispatcher.h"
-#include "ui/gfx/geometry/rect.h"
-
-namespace headless {
-
-class HeadlessWindowTreeHost : public aura::WindowTreeHost,
-                               public ui::PlatformEventDispatcher {
- public:
-  explicit HeadlessWindowTreeHost(const gfx::Rect& bounds);
-  ~HeadlessWindowTreeHost() override;
-
-  // ui::PlatformEventDispatcher:
-  bool CanDispatchEvent(const ui::PlatformEvent& event) override;
-  uint32_t DispatchEvent(const ui::PlatformEvent& event) override;
-
-  // WindowTreeHost:
-  ui::EventSource* GetEventSource() override;
-  gfx::AcceleratedWidget GetAcceleratedWidget() override;
-  void ShowImpl() override;
-  void HideImpl() override;
-  gfx::Rect GetBoundsInPixels() const override;
-  void SetBoundsInPixels(const gfx::Rect& bounds) override;
-  gfx::Point GetLocationOnScreenInPixels() const override;
-  void SetCapture() override;
-  void ReleaseCapture() override;
-  void SetCursorNative(gfx::NativeCursor cursor_type) override;
-  void MoveCursorToScreenLocationInPixels(const gfx::Point& location) override;
-  void OnCursorVisibilityChangedNative(bool show) override;
-  gfx::ICCProfile GetICCProfileForCurrentDisplay() override;
-
- private:
-  gfx::Rect bounds_;
-
-  DISALLOW_COPY_AND_ASSIGN(HeadlessWindowTreeHost);
-};
-
-}  // namespace headless
-
-#endif  // HEADLESS_LIB_BROWSER_HEADLESS_WINDOW_TREE_HOST_H_