Change-Id: I40c75af7e8469c3bf3d8fc73058e58152fe9d252
Change-Id: I5c54c2d9f7b931d6a1c3165254e98d6d7a136363
This is the final step of the process described at <https://www.mediawiki.org/wiki/Separating_skins_from_core_MediaWiki>. Corresponding core change: Idfc38503. Change-Id: I83b1efb4a489254c76e0cbda72ff34efa3d41261