Re-land "Format all multitests"

tests/language/mixin_forwarding_constructor4_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.
 
 // Verify that when no constructors are forwarded from the base class
 // through a mixin, it is always an error; the mixin does not acquire an
 // implicit default constructor.
 
 abstract class Mixin {}
 
 class Base {
   Base(
       {x} //       //# 01: compile-time error
       {x} //       //# 02: compile-time error
       {x} //       //# 03: compile-time error
-    );
+      );
 }
 
 class C extends Base with Mixin {
   C(); //          //# 02: continued
   C() : super(); //# 03: continued
 }
 
 main() {
   new C();
 }