Fix message_extraction test.

pkg/intl/test/message_extraction/make_hardcoded_translation.dart

Index: pkg/intl/test/message_extraction/make_hardcoded_translation.dart
diff --git a/pkg/intl/test/message_extraction/make_hardcoded_translation.dart b/pkg/intl/test/message_extraction/make_hardcoded_translation.dart
index dd907dea789c7414bb0eb211b42fbe424a116407..9da9dce690b44103b5576ca0a390d431d180d617 100644
--- a/pkg/intl/test/message_extraction/make_hardcoded_translation.dart
+++ b/pkg/intl/test/message_extraction/make_hardcoded_translation.dart
@@ -27,7 +27,7 @@ get serialization => new Serialization()
       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);
@@ -240,4 +240,4 @@ main() {
   var messages = json.parse(new File(fileArgs.first).readAsStringSync());
   translate(messages, "fr", french);
   translate(messages, "de_DE", german);
-}
+}