pkasting writes:
See if we can do something smarter with the search/alternate nav system,
whereby if the alternate nav successfully completes quickly enough, we
replace the search page with the nav page?


Concerns:
* The omnibox showed a "search" icon next to this suggestion.  Would it be weird to end up navigating?
* How fast is fast enough that it won't be disruptive?
  - Perhaps if the request finished before OnLoadCompleted for the search results page?
  - Or should it (also?) be timing related, e.g., <50 milliseconds.
* The alternate-nav-infobar only checks to see if a page (or valid redirect) exists.  It doesn't actually fetch.  It's possible that if we decide to show the navigation (because the infobar request returned successfully) and then bring the user to an error page.