The only icons to the left of the URL in Chrome (version 48.0.2564.82 m) on my Windows 7 computer are the home button and the one that looks like a page with a folded corner, inside the URL field, that gives site information, i.e., security and permissions. Right clicking on either does not produce an option of editing search engines.

As a moderator, I use the search the forums frequently, so quicker search method than using the inefficient FT search tool or manually typing "site:flyertalk.com/forum" in the Google search field would be welcome.