Change-Id: Id3accfe59711c4a57061fd6cf71d1ea3d5cc8721
Change-Id: Ia5c2e32f098649a00a1bedc31b9130ecd9d43d0f
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