The WikibaseRepo class has a getSiteLookup() method, a shortcut for getting the SiteLookup service from MediaWikiServices. It’s used in some other service wiring functions in WikibaseRepo, and those uses will be removed as we move the remaining services to the service wiring file (where we can use $services->getSiteLookup() instead). But it’s also called elsewhere, including in factory functions for API modules and special pages that could actually have a SiteLookup service properly injected. We should fix those uses, and either properly inject the SiteLookup or just call MediaWikiServices::getInstance()->getSiteLookup() directly, so that WikibaseRepo::getSiteLookup() can be removed once it’s no longer used by any other WikibaseRepo method.