NotificationController handles an ownership of NotificaitonClient

Source/modules/notifications/NotificationClient.h

Index: Source/modules/notifications/NotificationClient.h
diff --git a/Source/modules/notifications/NotificationClient.h b/Source/modules/notifications/NotificationClient.h
index 829694526febc226bc253ed9f82e5c67203b2764..aee6ea03ed2755d81473e923db5a0b2ef5bafb18 100644
--- a/Source/modules/notifications/NotificationClient.h
+++ b/Source/modules/notifications/NotificationClient.h
@@ -44,6 +44,8 @@ class Notification;
 class NotificationClient {
 
 public:
+    virtual ~NotificationClient() { }
+
     enum Permission {
         PermissionAllowed, // User has allowed notifications
         PermissionNotAllowed, // User has not yet allowed
@@ -68,9 +70,6 @@ public:
 
     // Checks the current level of permission.
     virtual Permission checkPermission(ExecutionContext*) = 0;
-
-protected:
-    virtual ~NotificationClient() { }
 };
 
 } // namespace WebCore