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

components/ui_devtools/views/ui_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_UI_ELEMENT_H_
-#define ASH_DEVTOOLS_UI_ELEMENT_H_
+#ifndef COMPONENTS_UI_DEVTOOLS_VIEWS_UI_ELEMENT_H_
+#define COMPONENTS_UI_DEVTOOLS_VIEWS_UI_ELEMENT_H_
 
 #include <vector>
 
-#include "ash/ash_export.h"
 #include "base/macros.h"
 #include "ui/aura/window.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/views/view.h"
 
-namespace ash {
-namespace devtools {
+namespace ui_devtools {
 
 class UIElementDelegate;
 
 // UIElement type.
 enum UIElementType { WINDOW, WIDGET, VIEW };
 
-class ASH_EXPORT UIElement {
+class UIElement {
  public:
   virtual ~UIElement();
   int node_id() const { return node_id_; };
   std::string GetTypeName() const;
   UIElement* parent() const { return parent_; };
   UIElementDelegate* delegate() const { return delegate_; };
   UIElementType type() const { return type_; };
   const std::vector<UIElement*>& children() const { return children_; };
 
   // |child| is inserted in front of |before|. If |before| is null, it
@@ skipping 30 matching lines @@
  private:
   const int node_id_;
   const UIElementType type_;
   std::vector<UIElement*> children_;
   UIElement* parent_;
   UIElementDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(UIElement);
 };
 
-}  // namespace devtools
-}  // namespace ash
+}  // namespace ui_devtools
 
-#endif  // ASH_DEVTOOLS_UI_ELEMENT_H_
+#endif  // COMPONENTS_UI_DEVTOOLS_VIEWS_UI_ELEMENT_H_