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

Source/core/accessibility/AXNodeObject.h

 /*
  * Copyright (C) 2012, Google 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 195 matching lines @@
     String alternativeTextForWebArea() const;
     void alternativeText(Vector<AccessibilityText>&) const;
     void ariaLabeledByText(Vector<AccessibilityText>&) const;
     void changeValueByPercent(float percentChange);
     void helpText(Vector<AccessibilityText>&) const;
     void titleElementText(Vector<AccessibilityText>&);
     void visibleText(Vector<AccessibilityText>&) const;
     float stepValueForRange() const;
 };
 
-inline AXNodeObject* toAXNodeObject(AXObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isAXNodeObject());
-    return static_cast<AXNodeObject*>(object);
-}
-
-inline const AXNodeObject* toAXNodeObject(const AXObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isAXNodeObject());
-    return static_cast<const AXNodeObject*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toAXNodeObject(const AXNodeObject*);
+DEFINE_AX_OBJECT_TYPE_CASTS(AXNodeObject, isAXNodeObject());
 
 } // namespace WebCore
 
 #endif // AXNodeObject_h