Fix message_extraction test.

pkg/intl/test/message_extraction/make_hardcoded_translation.dart

 #!/usr/bin/env dart
 // Copyright (c) 2013, 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.
 
 /**
  * This simulates a translation process, reading the messages generated
  * from extract_message.dart for the files sample_with_messages.dart and
  * part_of_sample_with_messages.dart and writing out hard-coded translations for
  * German and French locales.
  */
 
 import 'dart:io';
 import 'dart:json' as json;
 import 'package:path/path.dart' as path;
 import 'package:args/args.dart';
 import 'package:intl/src/intl_message.dart';
 import 'package:serialization/serialization.dart';
 
 /**
  * A serialization so that we can write out the more complex plural and
  * gender examples to JSON easily. This is a stopgap and should be replaced
  * with a commonly used translation file format.
  */
 get serialization => new Serialization()
   ..addRuleFor(new VariableSubstitution(0, null),
       constructorFields: ["index", "parent"])
   ..addRuleFor(new LiteralString("a", null),
       constructorFields: ["string", "parent"])
-  ..addRuleFor(new CompositeMessage([], null), constructor: "parent",
+  ..addRuleFor(new CompositeMessage([], null), constructor: "withParent",
       constructorFields: ["parent"]);
 var format = const SimpleFlatFormat();
 get writer => serialization.newWriter(format);
 
 /** A list of the French translations that we will produce. */
 var french = {
   "types" : r"$a, $b, $c",
   "multiLine" : "Cette message prend plusiers lignes.",
   "message2" : r"Un autre message avec un seul paramètre $x",
   "alwaysTranslated" : "Cette chaîne est toujours traduit",
@@ skipping 192 matching lines @@
   var parser = new ArgParser();
   parser.addOption("output-dir", defaultsTo: '.',
       callback: (value) => targetDir = value);
   parser.parse(args);
 
   var fileArgs = args.where((x) => x.contains('.json'));
 
   var messages = json.parse(new File(fileArgs.first).readAsStringSync());
   translate(messages, "fr", french);
   translate(messages, "de_DE", german);
-}
+}