Format all tests.

tests/language_strong/super_in_async6_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";
 
 import 'dart:async';
 
 class A {
   Future<int> foo(int x, int y, int z) async => x + y + z;
 }
 
 class B extends A {
   Future<int> foo(int x, int y, int z) async {
     var w = await super.foo(x, y, z);
     return w + 1;
   }
 }
 
 main() async {
   Expect.equals(7, await new B().foo(1, 2, 3));
-}
+}