Backed out changeset 87ef5029dd10 (bug 1434599) for failing in dom/serviceworkers/test/test_workerupdatefoundevent.html on a CLOSED TREE

dom/serviceworkers/test/mochitest.ini

@@ -341,6 +341,7 @@ tags = openwindow
 [test_workerUnregister.html]
 [test_workerUpdate.html]
 [test_workerupdatefoundevent.html]
+skip-if = !e10s # Bug 1433276
 [test_xslt.html]
 [test_async_waituntil.html]
 [test_worker_reference_gc_timeout.html]

dom/serviceworkers/test/worker_updatefoundevent.js

@@ -6,9 +6,7 @@
 registration.onupdatefound = function(e) {
   clients.matchAll().then(function(clients) {
     if (!clients.length) {
-      // We don't control any clients when the first update event is fired
-      // because we haven't reached the 'activated' state.
-      return;
+      reject("No clients found");
     }
 
     if (registration.scope.match(/updatefoundevent\.html$/)) {