RefCounted types should not have public destructors, chrome/ remaining parts

chrome/service/cloud_print/job_status_updater.h

 // Copyright (c) 2011 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 CHROME_SERVICE_CLOUD_PRINT_JOB_STATUS_UPDATER_H_
 #define CHROME_SERVICE_CLOUD_PRINT_JOB_STATUS_UPDATER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 20 matching lines @@
    protected:
     virtual ~Delegate() {}
   };
 
   JobStatusUpdater(const std::string& printer_name,
                    const std::string& job_id,
                    cloud_print::PlatformJobId& local_job_id,
                    const GURL& cloud_print_server_url,
                    cloud_print::PrintSystem* print_system,
                    Delegate* delegate);
-  virtual ~JobStatusUpdater();
 
   // Checks the status of the local print job and sends an update.
   void UpdateStatus();
   void Stop();
 
   // CloudPrintURLFetcher::Delegate implementation.
   virtual CloudPrintURLFetcher::ResponseAction HandleJSONData(
       const content::URLFetcher* source,
       const GURL& url,
       base::DictionaryValue* json_data,
       bool succeeded) OVERRIDE;
   virtual CloudPrintURLFetcher::ResponseAction OnRequestAuthError() OVERRIDE;
   virtual std::string GetAuthHeader() OVERRIDE;
 
  private:
+  friend class base::RefCountedThreadSafe<JobStatusUpdater>;
+  virtual ~JobStatusUpdater();
+
   std::string printer_name_;
   std::string job_id_;
   cloud_print::PlatformJobId local_job_id_;
   cloud_print::PrintJobDetails last_job_details_;
   scoped_refptr<CloudPrintURLFetcher> request_;
   GURL cloud_print_server_url_;
   scoped_refptr<cloud_print::PrintSystem> print_system_;
   Delegate* delegate_;
   // A flag that is set to true in Stop() and will ensure the next scheduled
   // task will do nothing.
   bool stopped_;
   DISALLOW_COPY_AND_ASSIGN(JobStatusUpdater);
 };
 
 // This typedef is to workaround the issue with certain versions of
 // Visual Studio where it gets confused between multiple Delegate
 // classes and gives a C2500 error. (I saw this error on the try bots -
 // the workaround was not needed for my machine).
 typedef JobStatusUpdater::Delegate JobStatusUpdaterDelegate;
 
 #endif  // CHROME_SERVICE_CLOUD_PRINT_JOB_STATUS_UPDATER_H_