How do I delete something from the drop-down menu of the URL bar. I went there accidentally and don't want it in the list.

I directly typed what I thought was the correct URL into the URL box. It took me to a site different from where I was wanting to go. Now that site's URL is in the list of URL's in the drop-down box. Is there some way of deleting this from the drop-down list? It seems to me that there used to be a way to do this--a small x on the right side of each site's URL in the list. After one of the updates this was no longer there.