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Per Ryan's recent announcement, SSLWatcher's Alpha log is no longer
recognized by Chrome, so remove it.

This change also removes the assumption (made in the CertPolicyEnforcer)
that in case of having only 2 logs recognized by Chrome, only 2 will
be required where the policy currently says 3 would be necessary.

BUG=441337

Review URL: https://codereview.chromium.org/795013003

Cr-Commit-Position: refs/heads/master@{#308437}