dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/21666_test.dart

 // Copyright (c) 2014, 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 issue 21666 - problems with method that has super calls.
 //
 // Use a method and getter with super calls in various ways.
 
 import 'package:expect/expect.dart';
 
 @MirrorsUsed(targets: const [A, B, Object])
 import 'dart:mirrors';
 
-class X { const X(); }
-class Y { const Y(); }
+class X {
+  const X();
+}
+
+class Y {
+  const Y();
+}
 
 typedef fInt(int x);
 typedef fString(String x);
 
 class A {
   @X()
   foo(int x) => x + 1;
   int get bar => A.g;
 
   static int g = 0;
@@ skipping 50 matching lines @@
   var bgbar = bm.getField(#bar);
 
   Expect.equals(300, bgfoo.reflectee(2));
   Expect.equals(400, bm.invoke(#foo, [3]).reflectee);
   Expect.equals(123000, bgbar.reflectee);
   Expect.isTrue(b.foo is fInt);
   Expect.isTrue(b.foo is! fString);
   Expect.isTrue(bgfoo.reflectee is fInt);
   Expect.isTrue(bgfoo.reflectee is! fString);
 }