[GTK] Clean-up use of deprecated GtkAction
Created attachment 395946 [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
Note that MiniBrowser is still using GtkAction and other APIs that are gone in GTK4. I didn't include that in this patch as it will require more work to redo the UI and we probably want to refresh it anyway a bit.
Committed r259799: <https://trac.webkit.org/changeset/259799> All reviewed patches have been landed. Closing bug and clearing flags on attachment 395946 [details].
<rdar://problem/61517516>