Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  b5aba162c00a8bf244b7fb1d6fd242888dd830fd

Clean up after DataModel 2.0 switch

Just some minor clean ups. Main change is the missing use clauses.

Change-Id: I4bd3823205fffc6bdcb37106369845fd918c9c7f