Change-Id: Ia47dfe4f5d2a5981630cb57c5802c40a01eb0028
Change-Id: Icb93def0b1e3a92a2e3dc59db1bd698affe55a42
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