Use CompletionHandler instead of PrintFinishedCallback
Created attachment 419788 [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 https://trac.webkit.org/wiki/WebKitGTK/AddingNewWebKit2API
Created attachment 419801 [details] Patch
Created attachment 419804 [details] Patch
http://trac.webkit.org/r272635
<rdar://problem/74173400>