it:ad:chrome:howto:Remove An Autosuggested Url

To delete a single autosuggested URL:

• start typing the address as you normally would.
• Then, when the unwanted autocomplete suggestion appears, use arrow keys to highlight the suggestion in the drop-down menu below the address bar.
• Shift+Delete.

* http://www.pcworld.com/article/2098431/how-to-erase-specific-autosuggested-urls-from-chrome-firefox-and-ie.html