Change-Id: Iab1b2191878a4782e8b415d1f36ce7bc7585ae94
Change-Id: I32d8cdda3dc1883e2a51475d87865761af6743cc
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