Keyboard Shortcut to Deselect Omnibox in Chrome ?

I am not a OS X user, but I think this should be the same as in Windows,press the Tab once or more time after selecting the Chrome address bar with Ctrl+L. In Windows pressing F6 once or more times will deselect the omnibox in chrome, but I don't know if this will work also in OS X, it is worth a try.

I've had the same issue but I found a simple hack. Just go to your Chrome settings and click manage search engines. Then add a new search engine with 'javascript:' as the url, and whatever word or key you want for the shortcut. I use Vim with jj or kk mapped to esc, so I used those two keys as the shortcut for my Chrome.