Remove workaround for deserialiser limitation
Remove workaround for deserialiser limitation

The deserialiser now sets prototype later, so we can define properties on intrp.Object instances in whatever order we like.

NeilFraser/CodeCity,NeilFraser/CodeCity,google/CodeCity,google/CodeCity,NeilFraser/CodeCity,google/CodeCity,google/CodeCity,NeilFraser/CodeCity