Migrating a block of dart 1 tests to dart 2

tests/language_2/closure_call_wrong_argument_count_negative_test.dart

 // Copyright (c) 2011, 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.
 // Test mismatch in argument counts.
 
 class ClosureCallWrongArgumentCountNegativeTest {
   static int melke(var f) {
     return f(1, 2, 3);
   }
 
   static void testMain() {
     kuh(int a, int b) {
       return a + b;
     }
 
     melke(kuh);
   }
 }
 
 main() {
   ClosureCallWrongArgumentCountNegativeTest.testMain();
 }