Update language tests to new optional parameter syntax and semantics.

tests/language/named_parameters_passing_null_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.
 
 // Dart test program for testing named parameters with 'null' passed as an
 // argument.
 
 
 class TestClass {
   TestClass();
 
   num method([value = 100]) => value;
+  num method2({value: 100}) => value;
 
   static num staticMethod([value = 200]) => value;
+  static num staticMethod2({value: 200}) => value;
 }
 
 num globalMethod([value = 300]) => value;
+num globalMethod2({value: 300}) => value;
 
 
 main() {
   var obj = new TestClass();
 
   Expect.equals(100, obj.method());
+  Expect.equals(100, obj.method2());
   Expect.equals(50, obj.method(50));
-  Expect.equals(50, obj.method(value: 50));
+  Expect.equals(50, obj.method2(value: 50));
   Expect.equals(null, obj.method(null));
-  Expect.equals(null, obj.method(value: null));
+  Expect.equals(null, obj.method2(value: null));
 
   Expect.equals(200, TestClass.staticMethod());
+  Expect.equals(200, TestClass.staticMethod2());
   Expect.equals(50, TestClass.staticMethod(50));
-  Expect.equals(50, TestClass.staticMethod(value: 50));
+  Expect.equals(50, TestClass.staticMethod2(value: 50));
   Expect.equals(null, TestClass.staticMethod(null));
-  Expect.equals(null, TestClass.staticMethod(value: null));
+  Expect.equals(null, TestClass.staticMethod2(value: null));
 
   Expect.equals(300, globalMethod());
+  Expect.equals(300, globalMethod2());
   Expect.equals(50, globalMethod(50));
-  Expect.equals(50, globalMethod(value: 50));
+  Expect.equals(50, globalMethod2(value: 50));
   Expect.equals(null, globalMethod(null));
-  Expect.equals(null, globalMethod(value: null));
+  Expect.equals(null, globalMethod2(value: null));
 }