I've tried it on multiple computers, restarted, tried it over the course of few months, but I can't ever get it to work. There are loads of reports on Google's forums and one in the chromium bug application, but no results.
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Not sure if this will help future travelers, but I think I had too much Autofill data saved. According to this chromium bug, the only way to get it fixed is to ask chromium people to nuke it for you.