Here is a quick way to delete a URL from the Chrome omnibar.

Type the query in the omnibar and wait for the suggestion to show up. Use the down arrow key to select the wrong URL and press “Shift + Del” (In Mac, use “Fn + Shift + Del”). This will immediately remove the item from the omnibar. Note: 1. This trick only applies to URL. You won’t be able to remove search term with the “Shift + Del” key. 2. This trick applies to Firefox as well, except that you just need to press “Delete” instead of “Shift + Delete”.