Updated mediawiki/extensions/Wikidata
Project: mediawiki/extensions/Wikibase  64463f52e28128544fdd41d2ed59a680aa9fb0f2

Remove the empty ItemContentDiffView

PropertyContent was even also using ItemContentDiffView,
indicating that both Item and Property should just be using
EntityContentDiffView.

Change-Id: I301eed3bce5d96fdedd68393aab759d290f67889