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

chrome/renderer/extensions/dispatcher.cc

 // 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.
 
 #include "chrome/renderer/extensions/dispatcher.h"
 
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/debug/alias.h"
 #include "base/json/json_reader.h"
@@ skipping 573 matching lines @@
     const base::DictionaryValue& source_tab,
     const ExtensionMsg_ExternalConnectionInfo& info) {
   MiscellaneousBindings::DispatchOnConnect(
       v8_context_set_.GetAll(),
       target_port_id, channel_name, source_tab,
       info.source_id, info.target_id, info.source_url,
       NULL);  // All render views.
 }
 
 void Dispatcher::OnDeliverMessage(int target_port_id,
-                                  const std::string& message) {
+                                  const base::ListValue& message) {
   MiscellaneousBindings::DeliverMessage(
       v8_context_set_.GetAll(),
       target_port_id,
       message,
       NULL);  // All render views.
 }
 
 void Dispatcher::OnDispatchOnDisconnect(int port_id,
                                         const std::string& error_message) {
   MiscellaneousBindings::DispatchOnDisconnect(
@@ skipping 848 matching lines @@
     std::string error_msg = base::StringPrintf(kMessage, function_name.c_str());
     v8::ThrowException(
         v8::Exception::Error(v8::String::New(error_msg.c_str())));
     return false;
   }
 
   return true;
 }
 
 }  // namespace extensions