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

Source/core/accessibility/AXTable.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 71 matching lines @@
     AccessibilityChildrenVector m_columns;
 
     RefPtr<AXObject> m_headerContainer;
     bool m_isAXTable;
 
     bool hasARIARole() const;
     virtual bool isTableExposableThroughAccessibility() const;
     virtual bool computeAccessibilityIsIgnored() const OVERRIDE;
 };
 
-inline AXTable* toAXTable(AXObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isAXTable());
-    return static_cast<AXTable*>(object);
-}
+DEFINE_AX_OBJECT_TYPE_CASTS(AXTable, isAXTable());
 
 } // namespace WebCore
 
 #endif // AXTable_h