Revert of Remove deprecated methods from Pickle.

ppapi/nacl_irt/ppapi_dispatcher.cc

 // Copyright 2014 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 "ppapi/nacl_irt/ppapi_dispatcher.h"
 
 #include <map>
 #include <set>
 
 #include "build/build_config.h"
@@ skipping 195 matching lines @@
   ManifestService* manifest_service = GetManifestService();
   if (manifest_service)
     manifest_service->StartupInitializationComplete();
 }
 
 void PpapiDispatcher::OnPluginDispatcherMessageReceived(
     const IPC::Message& msg) {
   // The first parameter should be a plugin dispatcher ID.
   PickleIterator iter(msg);
   uint32 id = 0;
-  if (!iter.ReadUInt32(&id)) {
+  if (!msg.ReadUInt32(&iter, &id)) {
     NOTREACHED();
     return;
   }
   std::map<uint32, proxy::PluginDispatcher*>::iterator dispatcher =
       plugin_dispatchers_.find(id);
   if (dispatcher != plugin_dispatchers_.end())
     dispatcher->second->OnMessageReceived(msg);
 }
 
 }  // namespace ppapi