Re-land "Format all multitests"

tests/language/issue_25671a_test.dart

 // Copyright (c) 2016, 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';
 
 class A {
   noSuchMethod() { //                                   //# 01: static type warning
     throw new Exception( //                             //# 01: continued
         "Wrong noSuchMethod() should not be called"); //# 01: continued
   } //                                                  //# 01: continued
 }
+
 class C extends A {
   test() {
     super.v = 1; //# 01: continued
   }
 }
+
 main() {
   C c = new C();
   Expect.throws(() => c.test(), (e) => e is NoSuchMethodError); //# 01: continued
 }