Update generated JS for codelab's pirate app.

src/site/codelabs/darrrt/examples/6-piratebadge/piratebadge.dart

Index: src/site/codelabs/darrrt/examples/6-piratebadge/piratebadge.dart
diff --git a/src/site/codelabs/darrrt/examples/6-piratebadge/piratebadge.dart b/src/site/codelabs/darrrt/examples/6-piratebadge/piratebadge.dart
index d4274306aa2d9dbf23567ec74cfee1f9413e06ca..e550c895884406f4f05d24a20da8df14329de69d 100644
--- a/src/site/codelabs/darrrt/examples/6-piratebadge/piratebadge.dart
+++ b/src/site/codelabs/darrrt/examples/6-piratebadge/piratebadge.dart
@@ -84,28 +84,18 @@ PirateName getBadgeNameFromStorage() {
   }
 }
 
-/* 
- * A class declaration.
- */
 class PirateName {
   
-  // static variables are shared by all instances.
-  // Random is a random number generator in dart:math.
   static final Random indexGen = new Random();
 
-  // List is a parameterized type. You can declare the type of the objects it contains.
   static List<String> names = [];
   static List<String> appellations = [];
 
-  // Instance variables. Private variables have names that start with underscore '_'.
   String _firstName;
   String _appellation;
   
-  // A constructor with two optional, named parameters.
   PirateName({String firstName, String appellation}) {
     
-    // Use nextInt to get a random integer from a Random object.
-    // Use length to get the number of items in a list.
     if (firstName == null) {
       _firstName = names[indexGen.nextInt(names.length)];
     } else {
@@ -118,23 +108,16 @@ class PirateName {
     }
   }
 
-  // A named constructor.
   PirateName.fromJSON(String jsonString) {
-    // JSON is the default implementation of a JSON encoder/decoder.
-    // Map is a collection of key-value pairs.
     Map storedName = JSON.decode(jsonString);
     _firstName = storedName['f'];
     _appellation = storedName['a'];
   }
 
-  // Fat arrow syntax is shorthand for a one-line function that returns a value.
   String toString() => pirateName;
 
-  // A getter provides read access to the member of an object.
-  String get jsonString => '{ "f": "$_firstName", "a": "$_appellation" } ';
+  String get jsonString => JSON.encode({"f": _firstName, "a": _appellation});
 
-  // The ternary operator is shorthand for if-then-else. 
-  // String interpolation lets you easily build strings from other objects.
   String get pirateName => _firstName.isEmpty ? '' : '$_firstName the $_appellation';
 
   static Future readyThePirates() {