RefCounted types should not have public destructors, delegate cleanup

chrome/browser/web_resource/notification_promo.h

Index: chrome/browser/web_resource/notification_promo.h
diff --git a/chrome/browser/web_resource/notification_promo.h b/chrome/browser/web_resource/notification_promo.h
index de40cca3791f2e43ce9e85f0c8f7c49237a839f7..bdc1d89e828f296c119b2f90f2b2fe017dcce757 100644
--- a/chrome/browser/web_resource/notification_promo.h
+++ b/chrome/browser/web_resource/notification_promo.h
@@ -28,12 +28,14 @@ class 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.