Replace JSON (de)serialization of extension messages with direct Value pickling.

chrome/renderer/extensions/miscellaneous_bindings.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_RENDERER_EXTENSIONS_MISCELLANEOUS_BINDINGS_H_
 #define CHROME_RENDERER_EXTENSIONS_MISCELLANEOUS_BINDINGS_H_
 
 #include <string>
 
 #include "chrome/renderer/extensions/chrome_v8_context_set.h"
 
 namespace base {
 class DictionaryValue;
+class ListValue;
 }
 
 namespace content {
 class RenderView;
 }
 
 namespace v8 {
 class Extension;
 }
 
@@ skipping 24 matching lines @@
       const std::string& target_extension_id,
       const GURL& source_url,
       content::RenderView* restrict_to_render_view);
 
   // Delivers a message sent using content script messaging to some of the
   // contexts in |bindings_context_set|. If |restrict_to_render_view| is
   // specified, only contexts in that render view will receive the message.
   static void DeliverMessage(
       const ChromeV8ContextSet::ContextSet& context_set,
       int target_port_id,
-      const std::string& message,
+      const base::ListValue& message,
       content::RenderView* restrict_to_render_view);
 
   // Dispatches the Port.onDisconnect event in response to the channel being
   // closed.
   static void DispatchOnDisconnect(
       const ChromeV8ContextSet::ContextSet& context_set,
       int port_id,
       const std::string& error_message,
       content::RenderView* restrict_to_render_view);
 };
 
 }  // namespace
 
 #endif  // CHROME_RENDERER_EXTENSIONS_MISCELLANEOUS_BINDINGS_H_