switch to using native JSON object

chrome/renderer/resources/renderer_extension_bindings.js

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // -----------------------------------------------------------------------------
 // NOTE: If you change this file you need to touch renderer_resources.grd to
 // have your change take effect.
 // -----------------------------------------------------------------------------
 
 var chrome = chrome || {};
@@ skipping 15 matching lines @@
     // when there are no more listeners.
   };
 
   // Map of port IDs to port object.
   chrome.Port.ports_ = {};
 
   // Called by native code when a channel has been opened to this context.
   chrome.Port.dispatchOnConnect_ = function(portId, tab) {
     var port = new chrome.Port(portId);
     if (tab) {
-      tab = goog.json.parse(tab);
+      tab = JSON.parse(tab);
     }
     port.tab = tab;
     chrome.Event.dispatch_("channel-connect", [port]);
   };
 
   // Called by native code when a message has been sent to the given port.
   chrome.Port.dispatchOnMessage_ = function(msg, portId) {
     var port = chrome.Port.ports_[portId];
     if (port) {
       if (msg) {
-        msg = goog.json.parse(msg);
+        msg = JSON.parse(msg);
       }
       port.onMessage.dispatch(msg, port);
     }
   };
 
   // Sends a message asynchronously to the context on the other end of this
   // port.
   chrome.Port.prototype.postMessage = function(msg) {
-    PostMessage(this.portId_, goog.json.serialize(msg));
+    // JSON.stringify doesn't support a root object which is undefined.
+    if (msg === undefined)
+      msg = null;
+    PostMessage(this.portId_, JSON.stringify(msg));
   };
 
   // Extension object.
   chrome.Extension = function(id) {
     this.id_ = id;
   };
 
   // Opens a message channel to the extension.  Returns a Port for
   // message passing.
   chrome.Extension.prototype.connect = function() {
     var portId = OpenChannelToExtension(this.id_);
     if (portId == -1)
       throw new Error("No such extension: '" + this.id_ + "'");
     return new chrome.Port(portId);
   };
 
   // Returns a resource URL that can be used to fetch a resource from this
   // extension.
   chrome.Extension.prototype.getURL = function(path) {
     return "chrome-extension://" + this.id_ + "/" + path;
   };
 })();