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the same origin (HostPortPair) and value (supports_spdy).

This change reduces the number of times SetSupportsSpdy tries to persist
HttpServerProperties to disk (currently ~5% of persist calls are due to
SetSupportsSpdy).

BUG=451256
R=rch@chromium.org

Review URL: https://codereview.chromium.org/1159853005

Cr-Commit-Position: refs/heads/master@{#333146}