RefCounted types should not have public destructors, chromeos edition

chrome/browser/chromeos/login/help_app_launcher.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 CHROME_BROWSER_CHROMEOS_LOGIN_HELP_APP_LAUNCHER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_HELP_APP_LAUNCHER_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
@@ skipping 20 matching lines @@
     // Showed whenever there're troubles signing in (online case).
     HELP_CANT_ACCESS_ACCOUNT = 188036,
     // Showed in case when account was disabled.
     HELP_ACCOUNT_DISABLED = 188756,
     // Showed in case when hosted account is used.
     HELP_HOSTED_ACCOUNT = 1054228,
   };
 
   // Parent window is used to show dialog.
   explicit HelpAppLauncher(gfx::NativeWindow parent_window);
-  virtual ~HelpAppLauncher();
 
   // Shows specified help topic.
   void ShowHelpTopic(HelpTopic help_topic_id);
 
   // Returns true if the dialog is currently open.
   bool is_open() const { return dialog_.get() && dialog_->is_open(); }
 
  protected:
+  virtual ~HelpAppLauncher();
+
   // LoginWebDialog::Delegate implementation:
   virtual void OnDialogClosed() OVERRIDE {}
 
  private:
+  friend class base::RefCountedThreadSafe<HelpAppLauncher>;
+
   // Shows help topic dialog for specified GURL.
   void ShowHelpTopicDialog(const GURL& topic_url);
 
   // Dialog used to display help like "Can't access your account".
   scoped_ptr<LoginWebDialog> dialog_;
 
   // Parent window which is passed to help dialog.
   gfx::NativeWindow parent_window_;
 
   DISALLOW_COPY_AND_ASSIGN(HelpAppLauncher);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_HELP_APP_LAUNCHER_H_