void*           aPropertyValue, void*           aDtorData)
void*           aPropertyValue)
DestroyOverflowPlaceholders(void*           aFrame,                            nsIAtom*        aPropertyName,                            void*           aPropertyValue,                            void*           aDtorData){  nsFrameList* overflowPlace = NS_STATIC_CAST(nsFrameList*, aPropertyValue);  delete overflowPlace;}