I have 17-beta, but here's the flag: "Prerender from omnibox Enables prerendering of suggestions from the Omnibox and predicts appropriate network actions (pr

I have 17-beta, but here's the flag: "Prerender from omnibox Enables prerendering of suggestions from the Omnibox and predicts appropriate network actions (prerendering, Instant, DNS preconnect) by calculating a confidence value for each Omnibox result." Your options are Automatic, Enabled, Disabled. Default was Automatic.