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Since the verdict field is currently marked as 'required', whenever Chrome (or Firefox) can't parse this field properly, it leads to an overall failure in parsing the entire proto message.

Making it optional with a default value (SAFE) solves that problem.

See: cl/131841696

BUG=

Review-Url: https://codereview.chromium.org/2292963004
Cr-Commit-Position: refs/heads/master@{#415771}