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

Source/core/accessibility/AXTableCell.h

Index: Source/core/accessibility/AXTableCell.h
diff --git a/Source/core/accessibility/AXTableCell.h b/Source/core/accessibility/AXTableCell.h
index 509ac64de6b874cb3f9b67e68d236117229887d2..c62d0d32c5ac136b49b42549b31523d170abb730 100644
--- a/Source/core/accessibility/AXTableCell.h
+++ b/Source/core/accessibility/AXTableCell.h
@@ -60,20 +60,7 @@ private:
     virtual bool computeAccessibilityIsIgnored() const OVERRIDE;
 };
 
-inline AXTableCell* toAXTableCell(AXObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isTableCell());
-    return static_cast<AXTableCell*>(object);
-}
-
-inline const AXTableCell* toAXTableCell(const AXObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isTableCell());
-    return static_cast<const AXTableCell*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toAXTableCell(const AXTableCell*);
+DEFINE_AX_OBJECT_TYPE_CASTS(AXTableCell, isTableCell());
 
 } // namespace WebCore