dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/10216b_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";
 
 // Tests codegen of methods reached only via mixin.
 
-class A  {
+class A {
   foo(x, [y]) => '$x;$y';
 }
 
-class B extends A with M1, M2, M3 {
-}
+class B extends A with M1, M2, M3 {}
 
 class M1 {}
 
 class M2 {
   // These methods are only defined in this non-first, non-last mixin.
   plain(x) => 'P $x';
   // Check arity stubs are also available.
   bar(x, [y]) => '$y,$x';
 }
 
 class M3 {}
 
 test() {
   var b = [new A(), new B()].last as B;
-  Expect.equals('1;2', b.foo(1,2));
+  Expect.equals('1;2', b.foo(1, 2));
   Expect.equals('2;null', b.foo(2));
   Expect.equals('P 3', b.plain(3));
-  Expect.equals('100,4', b.bar(4,100));
+  Expect.equals('100,4', b.bar(4, 100));
   Expect.equals('null,5', b.bar(5));
 }
 
 main() {
   new A();
   new B();
   // 'test' enters the compilation worklist after main, so the classes are
   // registered before the selectors.
   test();
 }