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

components/ui_devtools/devtools/ui_element_delegate.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_UI_ELEMENT_DELEGATE_H_
-#define ASH_DEVTOOLS_UI_ELEMENT_DELEGATE_H_
+#ifndef COMPONENTS_UI_DEVTOOLS_DEVTOOLS_UI_ELEMENT_DELEGATE_H_
+#define COMPONENTS_UI_DEVTOOLS_DEVTOOLS_UI_ELEMENT_DELEGATE_H_
 
 #include <vector>
 
-#include "ash/ash_export.h"
 #include "base/macros.h"
 #include "ui/aura/window.h"
 
-namespace ash {
+namespace ui {
 namespace devtools {
 
 class UIElement;
 
-class ASH_EXPORT UIElementDelegate {
+class UIElementDelegate {
  public:
   UIElementDelegate(){};
   virtual ~UIElementDelegate(){};
 
   virtual void OnUIElementAdded(UIElement* parent, UIElement* child) = 0;
 
   // Move |child| to different sibling index under |parent| in DOM tree.
   virtual void OnUIElementReordered(UIElement* parent, UIElement* child) = 0;
 
   // Remove ui_element in DOM tree.
   virtual void OnUIElementRemoved(UIElement* ui_element) = 0;
 
   // Update CSS agent when bounds change.
   virtual void OnUIElementBoundsChanged(UIElement* ui_element) = 0;
 
   // Return |window| highlighting status.
   virtual bool IsHighlightingWindow(aura::Window* window) = 0;
 
   DISALLOW_COPY_AND_ASSIGN(UIElementDelegate);
 };
 
 }  // namespace devtools
-}  // namespace ash
+}  // namespace ui
 
-#endif  // ASH_DEVTOOLS_UI_ELEMENT_DELEGATE_H_
+#endif  // COMPONENTS_UI_DEVTOOLS_DEVTOOLS_UI_ELEMENT_DELEGATE_H_