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HSTS/HPKP headers should only be parsed when the host is not an IP
address. This change requires fixing the HSTS/HPKP tests to use
localhost test server URLs instead of 127.0.0.1, with a corresponding
cert.

BUG=456712

Review URL: https://codereview.chromium.org/1059303002

Cr-Commit-Position: refs/heads/master@{#323913}