dart2js: run dartfmt on tests

tests/compiler/dart2js_native/native_library_same_name_used_lib2.dart

 // Copyright (c) 2011, 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.
 
 // Native implementation.
 
 library lib2;
-import 'native_library_same_name_used_lib1.dart';  // To get abstract class I.
+
+import 'native_library_same_name_used_lib1.dart'; // To get abstract class I.
 import 'dart:_js_helper';
 
 // Native impl has same name as abstract class.
 @Native("I")
 class Impl implements I {
-  Impl read() native;
-  write(Impl x) native;
+  Impl read() native ;
+  write(Impl x) native ;
 }