Call JS functions via native context instead of js builtins object.

src/json.js

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 234 matching lines @@
 // -------------------------------------------------------------------
 // JSON Builtins
 
 function JsonSerializeAdapter(key, object) {
   var holder = {};
   holder[key] = object;
   // No need to pass the actual holder since there is no replacer function.
   return JSONSerialize(key, holder, UNDEFINED, new InternalArray(), "", "");
 }
 
-utils.ExportToRuntime(function(to) {
-  to["json_serialize_adapter"] = JsonSerializeAdapter;
-});
+%InstallToContext(["json_serialize_adapter", JsonSerializeAdapter]);
 
 })