dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/deferred_fail_and_retry_test.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Test that when a deferred import fails to load, it is possible to retry.
 
 import "deferred_fail_and_retry_lib.dart" deferred as lib;
 import "package:expect/expect.dart";
 import "package:async_helper/async_helper.dart";
 import "dart:js" as js;
 
 main() {
   // We patch document.body.appendChild to change the script src on first
   // invocation.
-  js.context.callMethod("eval", ["""
+  js.context.callMethod("eval", [
+    """
     if (self.document) {
       oldAppendChild = document.body.appendChild;
       document.body.appendChild = function(element) {
         element.src = "non_existing.js";
         document.body.appendChild = oldAppendChild;
         document.body.appendChild(element);
       }
     }
     if (self.load) {
       oldLoad = load;
       load = function(uri) {
         load = oldLoad;
         load("non_existing.js");
       }
     }
-  """]);
+  """
+  ]);
 
   asyncStart();
   lib.loadLibrary().then((_) {
     Expect.fail("Library should not have loaded");
   }, onError: (error) {
     lib.loadLibrary().then((_) {
       Expect.equals("loaded", lib.foo());
     }, onError: (error) {
       Expect.fail("Library should have loaded this time");
     }).whenComplete(() {
       asyncEnd();
     });
   });
-}
+}