RefCounted types should not have public destructors, delegate cleanup

chrome/browser/web_resource/notification_promo.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_WEB_RESOURCE_NOTIFICATION_PROMO_H_
 #define CHROME_BROWSER_WEB_RESOURCE_NOTIFICATION_PROMO_H_
 #pragma once
 
 #include <string>
 
@@ skipping 10 matching lines @@
 class PrefService;
 class Profile;
 
 // Helper class for PromoResourceService that parses promo notification info
 // from json or prefs.
 class NotificationPromo
   : public base::RefCountedThreadSafe<NotificationPromo> {
  public:
   class Delegate {
    public:
-     virtual ~Delegate() {}
-     virtual void OnNotificationParsed(double start, double end,
-                                       bool new_notification) = 0;
-     // For testing.
-     virtual bool IsBuildAllowed(int builds_targeted) const { return false; }
-     virtual int CurrentPlatform() const { return PLATFORM_NONE; }
+    virtual void OnNotificationParsed(double start, double end,
+                                      bool new_notification) = 0;
+    // For testing.
+    virtual bool IsBuildAllowed(int builds_targeted) const { return false; }
+    virtual int CurrentPlatform() const { return PLATFORM_NONE; }
+
+   protected:
+    virtual ~Delegate() {}
   };
 
   // Static factory for creating new notification promos.
   static NotificationPromo* Create(Profile* profile, Delegate* delegate);
 
   static GURL PromoServerURL();
 
   // Initialize from json/prefs.
   void InitFromJson(const base::DictionaryValue& json);
   void InitFromPrefs();
@@ skipping 94 matching lines @@
   bool closed_;
 
   int build_;
   int platform_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationPromo);
 };
 
 #endif  // CHROME_BROWSER_WEB_RESOURCE_NOTIFICATION_PROMO_H_