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

Source/core/accessibility/AXRenderObject.h

 /*
  * Copyright (C) 2008 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
@@ skipping 213 matching lines @@
 
     void ariaSelectedRows(AccessibilityChildrenVector&);
     bool elementAttributeValue(const QualifiedName&) const;
     bool inheritsPresentationalRole() const;
     LayoutRect computeElementRect() const;
     VisibleSelection selection() const;
     String stringForRange(const PlainTextRange&) const;
     int indexForVisiblePosition(const VisiblePosition&) const;
 };
 
-inline AXRenderObject* toAXRenderObject(AXObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isAXRenderObject());
-    return static_cast<AXRenderObject*>(object);
-}
-
-inline const AXRenderObject* toAXRenderObject(const AXObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isAXRenderObject());
-    return static_cast<const AXRenderObject*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toAXRenderObject(const AXRenderObject*);
+DEFINE_AX_OBJECT_TYPE_CASTS(AXRenderObject, isAXRenderObject());
 
 } // namespace WebCore
 
 #endif // AXRenderObject_h