{ NS_ENSURE_ARG_POINTER(aCategoryName);
{ NS_ASSERTION(aCategoryName, "aCategoryName is NULL!");
nsCategoryManager::DeleteCategory( const char *aCategoryName ){  NS_ENSURE_ARG_POINTER(aCategoryName);  // the categories are arena-allocated, so we don't  // actually delete them. We just remove all of the  // leaf nodes.  PR_Lock(mLock);  CategoryNode* category = get_category(aCategoryName);  PR_Unlock(mLock);  if (category)    category->Clear();  return NS_OK;}