Fix a crash related to PPAPI scripting.

ppapi/proxy/dispatcher.cc

-// 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.
 
 #include "ppapi/proxy/dispatcher.h"
 
 #include <string.h>  // For memset.
 
 #include <map>
 
 #include "base/compiler_specific.h"
@@ skipping 51 matching lines @@
       static_cast<ApiID>(msg.routing_id()));
   if (!proxy) {
     NOTREACHED();
     return true;
   }
   return proxy->OnMessageReceived(msg);
 }
 
 void Dispatcher::SetSerializationRules(
     VarSerializationRules* var_serialization_rules) {
-  serialization_rules_.reset(var_serialization_rules);
+  serialization_rules_ = var_serialization_rules;
 }
 
 void Dispatcher::OnInvalidMessageReceived() {
 }
 
 }  // namespace proxy
 }  // namespace ppapi