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

chrome/renderer/extensions/extension_helper.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/extension_helper.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/json/json_string_value_serializer.h"
@@ skipping 256 matching lines @@
     const std::string& channel_name,
     const base::DictionaryValue& source_tab,
     const ExtensionMsg_ExternalConnectionInfo& info) {
   MiscellaneousBindings::DispatchOnConnect(
       dispatcher_->v8_context_set().GetAll(),
       target_port_id, channel_name, source_tab,
       info.source_id, info.target_id, info.source_url,
       render_view());
 }
 
-void ExtensionHelper::OnExtensionDeliverMessage(int target_id,
-                                                const std::string& message) {
+void ExtensionHelper::OnExtensionDeliverMessage(
+    int target_id,
+    const base::ListValue& message) {
   MiscellaneousBindings::DeliverMessage(dispatcher_->v8_context_set().GetAll(),
                                         target_id,
                                         message,
                                         render_view());
 }
 
 void ExtensionHelper::OnExtensionDispatchOnDisconnect(
     int port_id,
     const std::string& error_message) {
   MiscellaneousBindings::DispatchOnDisconnect(
@@ skipping 71 matching lines @@
   v8::Handle<v8::Context> script_context =
       render_view()->GetWebView()->mainFrame()->mainWorldScriptContext();
   ChromeV8Context* chrome_v8_context =
       dispatcher_->v8_context_set().GetByV8Context(script_context);
   if (!chrome_v8_context)
     return;
   chrome_v8_context->CallChromeHiddenMethod("OnAppWindowClosed", 0, NULL, NULL);
 }
 
 }  // namespace extensions