ContentSupportMap::Remove(nsIContent* aElement)
MatchSet::Remove(Match* aMatch)
ContentSupportMap::Remove(nsIContent* aElement){    PL_HashTableRemove(mMap, aElement);    PRInt32 count;    // If possible, use the special nsIXULContent interface to "peek"    // at the child count without accidentally creating children as a    // side effect, since we're about to rip 'em outta the map anyway.    nsCOMPtr<nsIXULContent> xulcontent = do_QueryInterface(aElement);    if (xulcontent) {        xulcontent->PeekChildCount(count);    }    else {        aElement->ChildCount(count);    }    for (PRInt32 i = 0; i < count; ++i) {        nsCOMPtr<nsIContent> child;        aElement->ChildAt(i, *getter_AddRefs(child));        Remove(child);    }    return NS_OK;}