dart2js: run dartfmt on tests

tests/compiler/dart2js_native/subclassing_3_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.
 
 import "package:expect/expect.dart";
 import 'dart:_js_helper' show Native, Creates, setNativeSubclassDispatchRecord;
 import 'dart:_interceptors' show Interceptor, findInterceptorForType;
 
 // Test calling convention of methods introduced on subclasses of native
 // class of mixin.
@@ skipping 11 matching lines @@
 
 class A extends N {}
 
 class B extends A with M {
   // [oof] is introduced only on this subclass of a native class.  It should
   // have interceptor calling convention.
   oof() => 'B';
   // [miz] is introduced only on the mixin-application A+M.
 }
 
-B makeB() native;
+B makeB() native ;
 
 @Creates('=Object')
-getBPrototype() native;
+getBPrototype() native ;
 
 void setup() native r"""
 function B() {}
 makeB = function(){return new B;};
 
 getBPrototype = function(){return B.prototype;};
 """;
 
 main() {
   setup();
 
   setNativeSubclassDispatchRecord(getBPrototype(), findInterceptorForType(B));
 
   B b = makeB();
   Expect.equals('1,B,M', b.foo(1));
 }