Bug 1356810: Follow-up: Fix xpcshell test for async subscript return value.

MozReview-Commit-ID: 2lgw8KzvjBT

--HG--
extra : rebase_source : db0dfd6eaf3dc32f56b25ba319dd797ec1b7b06a

js/xpconnect/tests/unit/test_bug1150106.js

@@ -30,6 +30,7 @@ function run_test() {
                        .getService(Ci.mozIJSSubScriptLoader);
   var p = scriptLoader.loadSubScriptWithOptions(uri.spec,
                                                 { target: srvScope,
-                                                  async: true });
+                                                  async: true,
+                                                  wantReturnValue: true });
   p.then(success, error);
 }