Change-Id: Ic1351f7569641450ac5c795d151c280d499551a0
Change-Id: I11cf90e7977f2f666b98cfa9ace95791d6428322
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