Consider no longer calling routerlist_remove_old_routers() from check_descriptor_callback()
2237 /* Remove dead routers. */
2238 /* XXXX This doesn't belong here, but it was here in the pre-
2239 * XXXX refactoring code. */
2240 routerlist_remove_old_routers();
2241 }
We should see if there's better place to call this function from.