RefCounted types should not have public destructors, net/

net/base/file_stream_net_log_parameters.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.
 
 // File stream error reporting.
 
 #ifndef NET_BASE_FILE_STREAM_NET_LOG_PARAMETERS_H_
 #define NET_BASE_FILE_STREAM_NET_LOG_PARAMETERS_H_
 #pragma once
 
 #include <string>
 
 #include "net/base/net_errors.h"
 #include "net/base/net_log.h"
 
 namespace net {
 
 // NetLog parameters when a FileStream has an error.
 class FileStreamErrorParameters : public net::NetLog::EventParameters {
  public:
   FileStreamErrorParameters(const std::string& operation,
                             int os_error,
                             net::Error net_error);
   virtual base::Value* ToValue() const OVERRIDE;
 
+ protected:
+  virtual ~FileStreamErrorParameters();
+
  private:
   std::string operation_;
   int os_error_;
   net::Error net_error_;
 
   DISALLOW_COPY_AND_ASSIGN(FileStreamErrorParameters);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_FILE_STREAM_NET_LOG_PARAMETERS_H_