[HTML] Remove the dependency on HTMLElementImp::eval(); patch 15

(HTMLLinkElementImp::notify, HTMLLinkElementImp::requestRefresh, HTMLLinkElementImp::refresh): New
(HTMLLinkElementImp::eval): Remove
(HTMLLinkElementImp::HTMLLinkElementImp, HTMLLinkElementImp::handleMutation, HTMLLinkElementImp::linkStyleSheet, HTMLLinkElementImp::linkIcon, HTMLLinkElementImp::setFavicon): Refine
(HTMLLinkElementImp::resetStyleSheet): New