Bug 1578325 - Disable test_async_waituntil.html for frequent failures. r=egao

Differential Revision: https://phabricator.services.mozilla.com/D44974

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

dom/serviceworkers/test/mochitest.ini

@@ -343,6 +343,7 @@ skip-if = verify || serviceworker_e10s
 [test_workerupdatefoundevent.html]
 [test_xslt.html]
 [test_async_waituntil.html]
+skip-if = true #Bug 1578325
 [test_worker_reference_gc_timeout.html]
 [test_nofetch_handler.html]
 [test_bad_script_cache.html]