Update language tests to new getter syntax.

dart/tests/language/naming3_test.dart

 // Copyright (c) 2012, 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.
 
 class A {
   var __PROTO__ = 499;
   var constructor = 1;
   var prototype = 2;
 }
 
 class B extends A {
-  get __PROTO__() => 42;
-  get constructor() => 3;
-  get prototype() => 4;
+  get __PROTO__ => 42;
+  get constructor => 3;
+  get prototype => 4;
 }
 
 main() {
   var a = new A();
   var b = new B();
   var list = [a, b];
   for (int i = 0; i < list.length; i++) {
     var proto = list[i].__PROTO__;
     var constructor = list[i].constructor;
     var prototype = list[i].prototype;
     if (i == 0) {
       Expect.equals(499, proto);
       Expect.equals(1, constructor);
       Expect.equals(2, prototype);
     } else {
       Expect.equals(42, proto);
       Expect.equals(3, constructor);
       Expect.equals(4, prototype);
     }
   }
 }