Change-Id: I6a5cb922acdac0a8b59f16af9d037d9f68a87fc7
Change-Id: I1b3d26c3e5be0134b3189a1e344c64576cc8ed03
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