Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  866e9bbaed195b4e5fd9e159f2520ab34f2cbfbf

Find better name for DataUpdateClosure

See discussion in
https://gerrit.wikimedia.org/r/#/c/135777/9/repo/includes/updates/DataUpdateClosure.php

Change-Id: Ia8048d45a3f30d2dc02c4f884975c54f28d92d25