Change-Id: Ib1f8652d7a435177de767c2012d90d57391f1c29
Change-Id: I7021fbaffd6142087793eeb6c162a5a717e8d820
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: I84fcf7ce6385b8323544cafe6912a00f1886d20d