dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/inference_nsm_mirrors_test.dart

 // Copyright (c) 2013, 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.
 
 // Regression test for dart2js that did type inferencing on parameters
 // whose type may change at runtime due to an invocation through
 // [InstanceMirror.delegate].
 
 @MirrorsUsed(targets: 'A')
 import 'dart:mirrors';
 import 'package:expect/expect.dart';
 
 class A {
   noSuchMethod(im) {
     reflect(new B()).delegate(im);
   }
 }
 
 class B {
   foo(a) => a + 42;
 }
 
 main() {
   Expect.equals(42, new B().foo(0));
   // In checked mode we should get a type error. In unchecked mode it should be
   // an argument error.
-  Expect.throws(() => new A().foo('foo'),
-                (e) => e is ArgumentError || e is TypeError);
+  Expect.throws(
+      () => new A().foo('foo'), (e) => e is ArgumentError || e is TypeError);
 }