Looks like someone messed with RequestContext when I wasn't looking at it.
WikiPage is a representation of the Title. It should not be possible for wikipage
to point to a different title than the context's title.
Fix this issue by unsetting WikiPage when setting title and updating title when
setting wikipage.
Change-Id: I40471b12d08763cb1b47b8382f96d8db94b4f319
