Implement Object.prototype.hasOwnProperty in generated code.

src/json.js

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 230 matching lines @@
 }
 
 
 function BasicSerializeObject(value, stack, builder) {
   if (!%PushIfAbsent(stack, value)) {
     throw MakeTypeError('circular_structure', $Array());
   }
   builder.push("{");
   var first = true;
   for (var p in value) {
-    if (%HasLocalProperty(value, p)) {
+    if (%HasOwnProperty(value, p)) {
       if (!first) {
         builder.push(%QuoteJSONStringComma(p));
       } else {
         builder.push(%QuoteJSONString(p));
       }
       builder.push(":");
       var before = builder.length;
       BasicJSONSerialize(p, value[p], stack, builder);
       if (before == builder.length) {
         builder.pop();
@@ skipping 76 matching lines @@
 }
 
 function SetupJSON() {
   InstallFunctions($JSON, DONT_ENUM, $Array(
     "parse", JSONParse,
     "stringify", JSONStringify
   ));
 }
 
 SetupJSON();