Change-Id: I5d980450dd3c3d95283ff69582adb2392a5eeb14
Change-Id: Ia2e345b66a27b295a27042358ba72094fc5513bf
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