Issue 25: Changing expire time to Session deletes cookie

1. Open Firebug and select Cookies panel.
2. Right click on TestCookie25 and pick the Edit action.
3. Check Session checkbox and press OK button.
4. The cookie should be still presented in the list and marked as Session cookie. (BUG)
5. Open the edit dialog on this cookie again and uncheck the Session checkbox. Press OK button.
6. The cookie should be still presented in the list. The Session flag should be removed. (BUG)