They should use the local vfs and the gsettings memory backend
Created attachment 219053 [details] Patch btw, this fixes messages like this one when running the tests: org.gtk.vfs.MountTracker.listMountableInfo call failed: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gtk.vfs.Daemon was not provided by any .service files (g-dbus-error-quark, 2)
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 r160480: <http://trac.webkit.org/changeset/160480>