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called with the same origin (HostPortPair) and nothing was deleted.

This change reduces the number of times ClearAlternativeService tries to
persist HttpServerProperties to disk (currently ~11% of persist calls
are due to ClearAlternativeService).

BUG=451256
R=rch@chromium.org

Review URL: https://codereview.chromium.org/1156513004

Cr-Commit-Position: refs/heads/master@{#333147}