Bug 483633 - Mochitest test_threadErrors.html runs fine but needs to check/report success; (Bv1) Add |ok(true, ...);| to test_longThread.html too; r+sr=jst

dom/src/threads/test/test_longThread.html

@@ -25,6 +25,7 @@ Tests of DOM Worker Threads (Bug 437152)
     switch (event.data) {
       case "done":
         if (++doneThreads == numThreads) {
+          ok(true, "All messages received from workers");
           SimpleTest.finish();
         }
         break;