Change-Id: I3498a2ccdf984ea86a008ae9944cd266fd5b76c3
Change-Id: I0df1a86e700f84ce735e480b1ca982278451ea3c
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