views: Move widget/ directory to ui/views.

ui/views/widget/root_view.h

 // Copyright (c) 2011 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 VIEWS_WIDGET_ROOT_VIEW_H_
-#define VIEWS_WIDGET_ROOT_VIEW_H_
+#ifndef UI_VIEWS_WIDGET_ROOT_VIEW_H_
+#define UI_VIEWS_WIDGET_ROOT_VIEW_H_
 #pragma once
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/focus/focus_search.h"
 #include "views/view.h"
 
 namespace ui {
@@ skipping 180 matching lines @@
 
   // Tracks drag state for a view.
   View::DragInfo drag_info;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(RootView);
 };
 
 }  // namespace internal
 }  // namespace views
 
-#endif  // VIEWS_WIDGET_ROOT_VIEW_H_
+#endif  // UI_VIEWS_WIDGET_ROOT_VIEW_H_