Revert of Remove support for legacy WebKit Notifications

Source/modules/notifications/NotificationClient.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 21 matching lines @@
 #ifndef NotificationClient_h
 #define NotificationClient_h
 
 #include "core/html/VoidCallback.h"
 #include "modules/notifications/NotificationPermissionCallback.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
 class ExecutionContext;
-class Notification;
+class NotificationBase;
 
 class NotificationClient {
 
 public:
     enum Permission {
         PermissionAllowed, // User has allowed notifications
         PermissionNotAllowed, // User has not yet allowed
         PermissionDenied // User has explicitly denied permission
     };
 
     // Requests that a notification be shown.
-    virtual bool show(Notification*) = 0;
+    virtual bool show(NotificationBase*) = 0;
 
     // Requests that a notification that has already been shown be canceled.
-    virtual void cancel(Notification*) = 0;
+    virtual void cancel(NotificationBase*) = 0;
 
     // Informs the presenter that a Notification object has been destroyed
     // (such as by a page transition). The presenter may continue showing
     // the notification, but must not attempt to call the event handlers.
-    virtual void notificationObjectDestroyed(Notification*) = 0;
+    virtual void notificationObjectDestroyed(NotificationBase*) = 0;
 
+#if ENABLE(LEGACY_NOTIFICATIONS)
     // Requests user permission to show desktop notifications from a particular
     // script context. The callback parameter should be run when the user has
     // made a decision.
+    virtual void requestPermission(ExecutionContext*, PassOwnPtr<VoidCallback>) = 0;
+#endif
     virtual void requestPermission(ExecutionContext*, PassOwnPtr<NotificationPermissionCallback>) = 0;
 
     // Checks the current level of permission.
     virtual Permission checkPermission(ExecutionContext*) = 0;
 
 protected:
     virtual ~NotificationClient() { }
 };
 
 } // namespace WebCore
 
 #endif // NotificationClient_h