aura_shell: Remove unused native_widget_types.h include from example_factory.h

ui/aura_shell/examples/example_factory.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 UI_AURA_SHELL_SHELL_FACTORY_H_
-#define UI_AURA_SHELL_SHELL_FACTORY_H_
+#ifndef UI_AURA_SHELL_EXAMPLES_EXAMPLE_FACTORY_H_
+#define UI_AURA_SHELL_EXAMPLES_EXAMPLE_FACTORY_H_
 #pragma once
 
-#include "ui/gfx/native_widget_types.h"
-
 namespace views {
 class View;
 }
 
 namespace aura_shell {
 namespace examples {
 
 void CreatePointyBubble(views::View* anchor_view);
 
-void CreateLock();
+void CreateLockScreen();
 
 // Creates a window showing samples of commonly used widgets.
 void CreateWidgetsWindow();
 
 }  // namespace examples
 }  // namespace aura_shell
 
-#endif  // UI_AURA_SHELL_SHELL_FACTORY_H_
+#endif  // UI_AURA_SHELL_EXAMPLES_EXAMPLE_FACTORY_H_