dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/mirror_invalid_field_access3_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.
 
 // Test that we cannot reflect on elements not covered by the `MirrorsUsed`
 // annotation.
 
 library test;
 
 @MirrorsUsed(targets: 'C.foo')
 import 'dart:mirrors';
 
 import 'package:expect/expect.dart';
 
 class C {
   static var foo;
   static var bar;
 }
 
 main() {
   C.bar = 1;
   var local = C.bar;
   var mirror = reflect(new C()).type; // Workaround bug 12799.
   Expect.equals(1, mirror.setField(const Symbol('foo'), 1).reflectee);
   Expect.equals(1, mirror.getField(const Symbol('foo')).reflectee);
-  Expect.throws(() => mirror.setField(const Symbol('bar'),  2),
-                (e) => e is NoSuchMethodError);
+  Expect.throws(() => mirror.setField(const Symbol('bar'), 2),
+      (e) => e is NoSuchMethodError);
   Expect.throws(() => mirror.getField(const Symbol('bar')),
-                (e) => e is NoSuchMethodError);
+      (e) => e is NoSuchMethodError);
 }