ZoomBounds.setSessionState now sets useCenterCoords. removed temporary "return null"
ZoomBounds.setSessionState now sets useCenterCoords.
removed temporary "return null"

Change-Id: Ia49d6ef17e32c0c0ef5f7c1a5cc87531ba971a2f

WeaveTeam/WeaveJS,WeaveTeam/WeaveJS,WeaveTeam/WeaveJS,WeaveTeam/WeaveJS