Move Aura to UI subdir.

ui/aura/root_window.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 AURA_ROOT_WINDOW_H_
-#define AURA_ROOT_WINDOW_H_
+#ifndef UI_AURA_ROOT_WINDOW_H_
+#define UI_AURA_ROOT_WINDOW_H_
 #pragma once
 
-#include "aura/window.h"
+#include "ui/aura/window.h"
 
 namespace aura {
 namespace internal {
 
 class FocusManager;
 
 // A Window subclass that handles event targeting for certain types of
 // MouseEvent.
 class RootWindow : public Window {
  public:
@@ skipping 13 matching lines @@
  private:
   Window* mouse_pressed_handler_;
   scoped_ptr<FocusManager> focus_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindow);
 };
 
 }  // namespace internal
 }  // namespace aura
 
-#endif  // AURA_ROOT_WINDOW_H_
+#endif  // UI_AURA_ROOT_WINDOW_H_