Change-Id: I8db4b18e86be0cc44cf0fbe39029c780c7b96b13
Change-Id: I313db2d873bd7f6e6d32a5df42e0ffb5e88a3f41
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