Refactor Pickle Read methods to use higher performance PickleIterator.

chrome/browser/extensions/extension_tabs_module.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/browser/extensions/extension_tabs_module.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/base64.h"
@@ skipping 1264 matching lines @@
 void UpdateTabFunction::WebContentsDestroyed(WebContents* tab) {
   CHECK_EQ(tab, web_contents_);
   web_contents_ = NULL;
 }
 
 bool UpdateTabFunction::OnMessageReceived(const IPC::Message& message) {
   if (message.type() != ExtensionHostMsg_ExecuteCodeFinished::ID)
     return false;
 
   int message_request_id = -1;
-  void* iter = NULL;
+  PickleReader iter(message);
   if (!message.ReadInt(&iter, &message_request_id)) {
     NOTREACHED() << "malformed extension message";
     return true;
   }
 
   if (message_request_id != request_id())
     return false;
 
   IPC_BEGIN_MESSAGE_MAP(UpdateTabFunction, message)
     IPC_MESSAGE_HANDLER(ExtensionHostMsg_ExecuteCodeFinished,
@@ skipping 449 matching lines @@
   // called for every API call the extension made.
   GotLanguage(language);
 }
 
 void DetectTabLanguageFunction::GotLanguage(const std::string& language) {
   result_.reset(Value::CreateStringValue(language.c_str()));
   SendResponse(true);
 
   Release();  // Balanced in Run()
 }