Bug 984048 - Temporarily disable serviceworker updatefound test. r=test-only

The updatefound test uses some bits that haven't landed yet, namely the ability to access running ServiceWorker instances using navigator.serviceWorker.controller.

--HG--
extra : rebase_source : dfacd3352d6d09c68ae1debcc0ce5f81127161e7

dom/workers/test/serviceworkers/test_installation_simple.html

@@ -128,7 +128,7 @@
       .then(abortPrevious)
       .then(networkError404)
       .then(parseError)
-      .then(updatefound)
+      //.then(updatefound)
       // put more tests here.
       .then(function() {
         SimpleTest.finish();