Use browsers JSON.parse for parsing JSON.

runtime/bin/json_patch.dart

Index: runtime/bin/json_patch.dart
diff --git a/samples/hi/hi.dart b/runtime/bin/json_patch.dart
similarity index 71%
copy from samples/hi/hi.dart
copy to runtime/bin/json_patch.dart
index 2ce0f41f920cf65027111390b2f071231db16638..c03845bbff3ff9d0253bef9d83af99c60e4891b1 100644
--- a/samples/hi/hi.dart
+++ b/runtime/bin/json_patch.dart
@@ -2,10 +2,6 @@
 // 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.
 
-library hi;
 
-import 'dart:html';
-
-main() {
-  query('#status').text = 'Hi, Dart';
-}
+patch parse(String json, [reviver(var key, var value)]) =>
+    _parse(json, reviver);