DestroyBCPropertyDataFunc(void*           aFrame,
DestroyBCPropertyDataFunc(nsPresContext* aPresContext, nsIFrame*       aFrame,
DestroyBCPropertyDataFunc(void*           aFrame,                          nsIAtom*        aPropertyName,                          void*           aPropertyValue,                          void*           aDtorData){  delete (BCPropertyData*)aPropertyValue;}