Get rid of custom bindings for HTMLLinkElement.sizes setter by leveraging the new [PutForwards=xxx] Web IDL extended attribute support: https://html.spec.whatwg.org/#htmllinkelement
Created attachment 261599 [details] Patch
Created attachment 261601 [details] Patch
Committed r190030: <http://trac.webkit.org/changeset/190030>
Follow-up GTK build fix: <https://trac.webkit.org/r190040>