So that they can be handled by parent widgets.
Created attachment 398177 [details] Patch
Thanks for the patch. If this patch contains new public API please make sure it follows the guidelines for new WebKit2 GTK+ API. See http://trac.webkit.org/wiki/WebKitGTK/AddingNewWebKit2API
Committed r261048: <https://trac.webkit.org/changeset/261048>