I have just landed a change (r49492) that removes the Go button, moves Stop functionality onto Reload, and separates the Reload button from the omnibox. This is part of the ongoing Chrome 6 UI work.
Because this change does not have a complete set of new images, it results in UI that looks mildly glitchy: no edges on the omnibox, and a stop button with a squared-off side.
Please do not report these as bugs. The intent is to address them in a set of followup patches within the next few days.
Thanks,
PK