Disable notification center in Yosemite

I tried several solutions to disable completely the notification center in Yosemite. For example, see http://ift.tt/1GIYYLr or http://ift.tt/1GIYZ1G.

These solutions disable the notification panel, but, in Yosemite, the notification icon of the menu bar is still there.

How can I remove the menu bar icon ?

I know the bartender software can do that but I am looking for a solution which does not require addind another app.