RefCounted types should not have public destructors, net/ edition

net/curvecp/packetizer.h

 // 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 NET_CURVECP_PACKETIZER_H_
 #define NET_CURVECP_PACKETIZER_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "net/base/completion_callback.h"
 #include "net/curvecp/connection_key.h"
 
 namespace net {
 
 class IPEndPoint;
 
 class Packetizer {
  public:
   class Listener {
    public:
     virtual ~Listener() {}
     // Callback for new connections.
     virtual void OnConnection(ConnectionKey key) = 0;
     virtual void OnMessage(Packetizer* packetizer,
                            ConnectionKey key,
                            unsigned char* msg,
                            size_t length)  = 0;
   };
 
-  virtual ~Packetizer() {}
-
   // Send a message on a connection.
   virtual int SendMessage(ConnectionKey key,
                           const char* data,
                           size_t length,
                           const CompletionCallback& callback) = 0;
 
   // Close an existing connection.
   virtual void Close(ConnectionKey key) = 0;
 
   virtual int GetPeerAddress(IPEndPoint* addresses) const = 0;
 
   // Returns the current maximum message size which can be fit into the next
   // message payload to be sent on the packetizer.
   virtual int max_message_payload() const = 0;
+
+ protected:
+  virtual ~Packetizer() {}
 };
 
 }  // namespace net
 
 #endif  // NET_CURVECP_PACKETIZER_H_