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static void requestPermission(NotificationPermissionCallback callback);

There is one parameter to requestPermission method. However, if this method is called without it, the Callback pointer that is passed to NotificationPresenterClientQt will be invalid and finally will lead to this crash.

The simple "window.webkitNotifications.requestPermission();" should crash it.

I've added two patches, the first checks the validity of callback pointer right before using it, while the second rather prevents adding invalid callback pointer into m_callbacks array.
I'd prefer the behavior of the second patch.

Both patches fixes the crash and enables desktop notifications on gmail.com

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