Update language tests to new getter syntax.

dart/tests/language/call_through_null_getter_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.
 
 // Tests that we can call functions through getters which return null.
 
 final TOP_LEVEL_NULL = null;
 
 var topLevel;
 
@@ skipping 67 matching lines @@
     return result;
   }
 
 }
 
 
 class A {
 
   A() { }
   var field;
-  get getter() { return field; }
+  get getter { return field; }
   method() { return field; }
 
 }
 
 main() {
   CallThroughNullGetterTest.testMain();
 }