NS_ADDREF(list);  nsStringKey key(aName);  aHash.Put(&key, list);
entry->mContentList = list;
AddEmptyListToHash(const nsAReadableString& aName, nsHashtable& aHash){  nsBaseContentList *list = new nsBaseContentList();  if (!list) {    return NS_ERROR_OUT_OF_MEMORY;  }  NS_ADDREF(list);  nsStringKey key(aName);  aHash.Put(&key, list);  return NS_OK;}