How to Auto-Hide the address bar in Google Chrome?

I'm not entirely sure I understand what you're asking, but I think you mean in full screen mode judging by the tags.

Simply uncheck View > Always Show Toolbar in Full Screen (⇧⌘F):

As in other answers to this question, the best option I could find is by running chrome from a shell and passing in the --app (which runs google chrome in application mode or something of the sort) option as follows:

/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --app="http://www.google.com"

go to chrome://flags and then search for Immersive Fullscreen Toolbar and set the value to Enabled, and that's it.

Or follow the following link to go directly to that setting.

chrome://flags/#enable-immersive-fullscreen-toolbar

To get full screen w/o address bar in Chrome on OSX use Cmd-Shift-F

You cannot disable 100% the address bar in any browser anymore.

To do that, you need to recompile the sources of Chromium, Firefox etc. with the necessary changes.

This rule of mandatory address bar has been accepted because of scams and other critical issues caused by people that create fake evil things.