Fix a crash related to PPAPI scripting.

ppapi/proxy/plugin_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 "ppapi/proxy/plugin_dispatcher.h"
 
 #include <map>
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
@@ skipping 47 matching lines @@
                       static_cast<int32_t>(PP_ERROR_ABORTED));
   }
 }
 
 PluginDispatcher::PluginDispatcher(base::ProcessHandle remote_process_handle,
                                    GetInterfaceFunc get_interface)
     : Dispatcher(remote_process_handle, get_interface),
       plugin_delegate_(NULL),
       received_preferences_(false),
       plugin_dispatcher_id_(0) {
-  SetSerializationRules(new PluginVarSerializationRules);
+  SetSerializationRules(new PluginVarSerializationRules(AsWeakPtr()));
 
   if (!g_live_dispatchers)
     g_live_dispatchers = new DispatcherSet;
   g_live_dispatchers->insert(this);
 }
 
 PluginDispatcher::~PluginDispatcher() {
   if (plugin_delegate_)
     plugin_delegate_->Unregister(plugin_dispatcher_id_);
 
@@ skipping 209 matching lines @@
   // once they're set. The user will have to restart to get new font prefs
   // propogated to plugins.
   if (!received_preferences_) {
     received_preferences_ = true;
     preferences_ = prefs;
   }
 }
 
 }  // namespace proxy
 }  // namespace ppapi