This method is not used anywhere anymore.
|mediawiki/extensions/MobileFrontend : master||Hygiene: Remove getWikiBaseItemId util|
It's super minor. I was hoping someone should just +2. It removes dead code which isn't referenced anywhere. 0.5 if you want to point. This is one of those things that I hate having to push through our process. Writing and managing the ticket is more work than the change itself :)