RefCounted types should not have public destructors, chromeos edition

chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.cc

 // 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 "chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.h"
 
 #include "ash/screensaver/screensaver_view.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/lazy_instance.h"
@@ skipping 23 matching lines @@
  public:
   explicit ScreensaverUnpackerClient(const UnpackCallback& unpacker_callback)
       : unpack_callback_(unpacker_callback) {}
 
   void OnUnpackSuccess(const FilePath& temp_dir,
                        const FilePath& extension_root,
                        const base::DictionaryValue* original_manifest,
                        const Extension* extension) OVERRIDE;
   void OnUnpackFailure(const string16& error) OVERRIDE;
 
+ protected:
+  virtual ~ScreensaverUnpackerClient() {}
+
  private:
   void LoadScreensaverExtension(
       const FilePath& extension_base_path,
       const FilePath& screensaver_extension_path);
 
   UnpackCallback unpack_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreensaverUnpackerClient);
 };
 
@@ skipping 176 matching lines @@
 
   g_kiosk_mode_screensaver = new KioskModeScreensaver();
 }
 
 void ShutdownKioskModeScreensaver() {
   delete g_kiosk_mode_screensaver;
   g_kiosk_mode_screensaver = NULL;
 }
 
 }  // namespace chromeos