Fix a crash related to PPAPI scripting.

ppapi/proxy/dispatcher.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
 #ifndef PPAPI_PROXY_DISPATCHER_H_
 #define PPAPI_PROXY_DISPATCHER_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
+#include "base/memory/ref_counted.h"
 #include "base/tracked_objects.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_module.h"
 #include "ppapi/proxy/proxy_channel.h"
 #include "ppapi/proxy/interface_list.h"
 #include "ppapi/proxy/interface_proxy.h"
 #include "ppapi/proxy/plugin_var_tracker.h"
 #include "ppapi/shared_impl/api_id.h"
 
@@ skipping 57 matching lines @@
   // IPC::Channel::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
   GetInterfaceFunc local_get_interface() const { return local_get_interface_; }
 
  protected:
   Dispatcher(base::ProcessHandle remote_process_handle,
              GetInterfaceFunc local_get_interface);
 
   // Setter for the derived classes to set the appropriate var serialization.
-  // Takes ownership of the given pointer, which must be on the heap.
+  // Takes one reference of the given pointer, which must be on the heap.
   void SetSerializationRules(VarSerializationRules* var_serialization_rules);
 
   // Called when an invalid message is received from the remote site. The
   // default implementation does nothing, derived classes can override.
   virtual void OnInvalidMessageReceived();
 
   bool disallow_trusted_interfaces() const {
     return disallow_trusted_interfaces_;
   }
 
  private:
   friend class HostDispatcherTest;
   friend class PluginDispatcherTest;
 
   // Lists all lazily-created interface proxies.
   scoped_ptr<InterfaceProxy> proxies_[API_ID_COUNT];
 
   bool disallow_trusted_interfaces_;
 
   GetInterfaceFunc local_get_interface_;
 
-  scoped_ptr<VarSerializationRules> serialization_rules_;
+  scoped_refptr<VarSerializationRules> serialization_rules_;
 
   DISALLOW_COPY_AND_ASSIGN(Dispatcher);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_DISPATCHER_H_