[HTML] Remove the dependency on HTMLElementImp::eval(); patch 16

(HTMLObjectElementImp::notify, HTMLObjectElementImp::requestRefresh, HTMLObjectElementImp::refresh, HTMLObjectElementImp::handleRefresh): New
(HTMLObjectElementImp::eval): Remove
(HTMLElementImp::current): Rename from request
(HTMLImageElementImp::handleMutation, HTMLImageElementImp::notify): Refine
[HTML] Remove the dependency on HTMLElementImp::eval(); patch 17

(NodeImp::eval, HTMLElementImp::eval): Remove; all callers changed