Revert of Create a unified UIElement interface for Widget, View and Window.

ash/devtools/window_element.h

Index: ash/devtools/window_element.h
diff --git a/ash/devtools/window_element.h b/ash/devtools/window_element.h
deleted file mode 100644
index 2f4996f4f9cd9568b6d03a664e0df0490a9b8a1b..0000000000000000000000000000000000000000
--- a/ash/devtools/window_element.h
+++ /dev/null
@@ -1,54 +0,0 @@
-// Copyright 2017 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 ASH_DEVTOOLS_WINDOW_ELEMENT_H_
-#define ASH_DEVTOOLS_WINDOW_ELEMENT_H_
-
-#include "ash/ash_export.h"
-#include "ash/devtools/ui_element.h"
-#include "base/macros.h"
-#include "ui/aura/window.h"
-#include "ui/aura/window_observer.h"
-#include "ui/gfx/geometry/rect.h"
-
-namespace ash {
-namespace devtools {
-
-class ASH_EXPORT WindowElement : public aura::WindowObserver, public UIElement {
- public:
-  WindowElement(aura::Window* window,
-                UIElementDelegate* ui_element_delegate,
-                UIElement* parent);
-  ~WindowElement() override;
-  aura::Window* window() const { return window_; };
-
-  // WindowObserver:
-  void OnWindowHierarchyChanging(
-      const aura::WindowObserver::HierarchyChangeParams& params) override;
-  void OnWindowHierarchyChanged(
-      const aura::WindowObserver::HierarchyChangeParams& params) override;
-  void OnWindowStackingChanged(aura::Window* window) override;
-  void OnWindowBoundsChanged(aura::Window* window,
-                             const gfx::Rect& old_bounds,
-                             const gfx::Rect& new_bounds) override;
-
-  // UIElement:
-  void GetBounds(gfx::Rect* bounds) const override;
-  void SetBounds(const gfx::Rect& bounds) override;
-  void GetVisible(bool* visible) const override;
-  void SetVisible(bool visible) override;
-  std::pair<aura::Window*, gfx::Rect> GetNodeWindowAndBounds() const override;
-
-  static aura::Window* From(UIElement* element);
-
- private:
-  aura::Window* window_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowElement);
-};
-
-}  // namespace devtools
-}  // namespace ash
-
-#endif  // ASH_DEVTOOLS_WINDOW_ELEMENT_H_