dart2js: run dartfmt on tests

tests/compiler/dart2js/data/mirrors_helper.dart

 // Copyright (c) 2012, 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.
 
 /**
  * This file is read by 'mirrors_test.dart'.
  */
 
 library mirrors_helper;
 
-typedef E Func<E,F extends Foo>(F f);
+typedef E Func<E, F extends Foo>(F f);
 
-main() {
-
-}
+main() {}
 
 /// Singleline doc comment.
 @Metadata(null)
 // Singleline comment 1.
 // Singleline comment 2.
 @Metadata(true)
 @Metadata(false)
 @Metadata(0)
 @Metadata(1.5)
 @Metadata("Foo")
 @Metadata(const ["Foo"])
-@Metadata(const {'foo':"Foo"})
+@Metadata(const {'foo': "Foo"})
 @metadata
 /** Multiline doc comment. */
 /* Multiline comment. */ class Foo {
   m(@metadata a) {}
 }
 
+abstract class Bar<E> {}
 
-abstract class Bar<E> {
-
-}
-
-class Baz<E,F extends Foo> implements Bar<E> {
+class Baz<E, F extends Foo> implements Bar<E> {
   Baz();
   const Baz.named();
-  factory Baz.factory() => new Baz<E,F>();
+  factory Baz.factory() => new Baz<E, F>();
 
   static method1(e) {}
   void method2(E e, [F f = null]) {}
-  Baz<E,F> method3(E func1(F f), Func<E,F> func2) => null;
+  Baz<E, F> method3(E func1(F f), Func<E, F> func2) => null;
 
-  bool operator==(Object other) => false;
-  int operator-() => 0;
+  bool operator ==(Object other) => false;
+  int operator -() => 0;
   operator$foo() {}
 }
 
 class Boz extends Foo {
   var field1;
   int _field2;
   final String field3 = "field3";
 
   int get field2 => _field2;
   void set field2(int value) {
     _field2 = value;
   }
 }
 
 class _PrivateClass {
   var _privateField;
   get _privateGetter => _privateField;
   void set _privateSetter(value) => _privateField = value;
   void _privateMethod() {}
   _PrivateClass._privateConstructor();
   factory _PrivateClass._privateFactoryConstructor() => null;
 }
 
 const metadata = const Metadata(null);
 
 class Metadata {
   final data;
   const Metadata(this.data);
-}
+}