Service Worker:Layouttests:Remove wrong done() call from serviceworkerobject-scripturl.html

LayoutTests/http/tests/serviceworker/serviceworkerobject-scripturl.html

Index: LayoutTests/http/tests/serviceworker/serviceworkerobject-scripturl.html
diff --git a/LayoutTests/http/tests/serviceworker/serviceworkerobject-scripturl.html b/LayoutTests/http/tests/serviceworker/serviceworkerobject-scripturl.html
index aff54eefc6fb4a68cf9e4408557ac07162bea817..6267a7cb0661e8d75beb85162f3484e8925bdc3e 100644
--- a/LayoutTests/http/tests/serviceworker/serviceworkerobject-scripturl.html
+++ b/LayoutTests/http/tests/serviceworker/serviceworkerobject-scripturl.html
@@ -17,8 +17,8 @@ function url_test(name, url) {
         assert_equals(worker.scriptURL, expectedURL,
                       'Returned ServiceWorker object should have scriptURL');
         service_worker_unregister_and_done(t, scope);
-      }));
-    t.done();
+      }))
+      .catch(unreached_rejection(t));
   }, 'Verify the scriptURL property: ' + name);
 }