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

components/ui_devtools/devtools/widget_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_WIDGET_ELEMENT_H_
-#define ASH_DEVTOOLS_WIDGET_ELEMENT_H_
+#ifndef COMPONENTS_UI_DEVTOOLS_DEVTOOLS_WIDGET_ELEMENT_H_
+#define COMPONENTS_UI_DEVTOOLS_DEVTOOLS_WIDGET_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/gfx/geometry/rect.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_observer.h"
 #include "ui/views/widget/widget_removals_observer.h"
 
-namespace ash {
+namespace ui {
 namespace devtools {
 
 class UIElementDelegate;
 
-class ASH_EXPORT WidgetElement : public views::WidgetRemovalsObserver,
-                                 public views::WidgetObserver,
-                                 public UIElement {
+class WidgetElement : public views::WidgetRemovalsObserver,
+                      public views::WidgetObserver,
+                      public UIElement {
  public:
   WidgetElement(views::Widget* widget,
                 UIElementDelegate* ui_element_delegate,
                 UIElement* parent);
   ~WidgetElement() override;
   views::Widget* widget() const { return widget_; };
 
   // views::WidgetRemovalsObserver:
   void OnWillRemoveView(views::Widget* widget, views::View* view) override;
 
@@ skipping 10 matching lines @@
 
   static views::Widget* From(UIElement* element);
 
  private:
   views::Widget* widget_;
 
   DISALLOW_COPY_AND_ASSIGN(WidgetElement);
 };
 
 }  // namespace devtools
-}  // namespace ash
+}  // namespace ui
 
-#endif  // ASH_DEVTOOLS_WIDGET_ELEMENT_H_
+#endif  // COMPONENTS_UI_DEVTOOLS_DEVTOOLS_WIDGET_ELEMENT_H_