Clean up WebCookieManagerProxy
Created attachment 431551 [details] Patch
Created attachment 431558 [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
r278941
<rdar://problem/79406237>