Change-Id: I1f23f2b3ad9e2462973cafa2d96791bbeb854178
Change-Id: Id8cda8aea8ce293f7b0a23688c260244388c3173
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