I have Google Chrome 27 dev (specifically, 27.0.1438.7) installed on my Macbook Pro at home and my iMac at work. Both Macs are on 10.8.3.
At work my omnibox auto-completes the way I have always seen it: a menu drops down with suggestions.
However, at home I now get this:
A panel extends down. I have gone into Chrome Flags on both and clicked "reset to defaults" and it's driving me nuts as to what is causing this behavior on only one.
Both instances sync with each other and have the same extensions.
EDIT: My new tab page now looks like this too: