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changes to disk every 500ms instead of 5secs. We are hoping if QUIC is
used as an alternate protocol, we will persist that information to disk
quicker. Hopefully, this would improve the QUIC winning the alternate
protocol race.

R=rch@chromium.org

Review URL: https://codereview.chromium.org/667473003

Cr-Commit-Position: refs/heads/master@{#300318}