Delete stray comment in tests.

tests/language/regress_26668_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.
-// Tests that the VM does not crash on weird corner cases of class Math.
 
 import 'dart:async';
 
 main() async {
   var myClass = new CustomClass<int>();
   await myClass.processData();
 }
 
 class CustomClass<T> {
   Future<T> processData() async {
     return 0;
   }
 }