Move DevTools out of ash and turn it to a component.

components/ui_devtools/devtools/window_element.h

 // 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_
+#ifndef COMPONENTS_UI_DEVTOOLS_DEVTOOLS_WINDOW_ELEMENT_H_
+#define COMPONENTS_UI_DEVTOOLS_DEVTOOLS_WINDOW_ELEMENT_H_
 
-#include "ash/ash_export.h"
-#include "ash/devtools/ui_element.h"
 #include "base/macros.h"
+#include "components/ui_devtools/devtools/ui_element.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_observer.h"
 #include "ui/gfx/geometry/rect.h"
 
-namespace ash {
+namespace ui {
 namespace devtools {
 
-class ASH_EXPORT WindowElement : public aura::WindowObserver, public UIElement {
+class 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;
@@ skipping 13 matching lines @@
 
   static aura::Window* From(UIElement* element);
 
  private:
   aura::Window* window_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowElement);
 };
 
 }  // namespace devtools
-}  // namespace ash
+}  // namespace ui
 
-#endif  // ASH_DEVTOOLS_WINDOW_ELEMENT_H_
+#endif  // COMPONENTS_UI_DEVTOOLS_DEVTOOLS_WINDOW_ELEMENT_H_