Introduce DEFINE_AX_OBJECT_TYPE_CASTS to replace manual toFoo() in accessibility child class

Source/core/accessibility/AXMenuListOption.h

 /*
  * Copyright (C) 2010 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 43 matching lines @@
     virtual bool isSelected() const OVERRIDE;
     virtual void setSelected(bool) OVERRIDE;
     virtual bool canSetSelectedAttribute() const OVERRIDE;
     virtual LayoutRect elementRect() const OVERRIDE;
     virtual String stringValue() const OVERRIDE;
     virtual bool computeAccessibilityIsIgnored() const OVERRIDE;
 
     RefPtr<HTMLElement> m_element;
 };
 
-inline AXMenuListOption* toAXMenuListOption(AXObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isMenuListOption());
-    return static_cast<AXMenuListOption*>(object);
-}
-
-inline const AXMenuListOption* toAXMenuListOption(const AXObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isMenuListOption());
-    return static_cast<const AXMenuListOption*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toAXMenuListOption(const AXMenuListOption*);
+DEFINE_AX_OBJECT_TYPE_CASTS(AXMenuListOption, isMenuListOption());
 
 } // namespace WebCore
 
 #endif // AXMenuListOption_h