Bug 1582999 - Disable test_cross_origin_iframe.html of fission because of permafailures r=mccr8

Differential Revision: https://phabricator.services.mozilla.com/D47057

--HG--
extra : moz-landing-system : lando

dom/permission/tests/mochitest.ini

@@ -7,4 +7,5 @@ prefs =
   dom.security.featurePolicy.webidl.enabled=true
 
 [test_cross_origin_iframe.html]
+skip-if = fission #Bug 1580462
 [test_permissions_api.html]