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called with the same origin (HostPortPair) more than once and if we
didn't change anything in  broken_alternative_services_ (in other words
the return value of IsAlternativeServiceBroken hasn't changed).

This change reduces the number of times ConfirmAlternativeService tries to
persist HttpServerProperties to disk (currently ~17% of persist calls
are due to ConfirmAlternativeService).

BUG=451256
R=rch@chromium.org

Review URL: https://codereview.chromium.org/1142413004

Cr-Commit-Position: refs/heads/master@{#333169}