Change-Id: I751af24448f6260460d880653e37f7f82efae6d0
Change-Id: I9e598701d331f8ef4ff4282cdf8673464f04a6bd
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