Certificate Transparency: Remove SSLWatcher's Alpha log.

Certificate Transparency: Remove SSLWatcher's Alpha log.

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
Committed: https://crrev.com/bce7c1b31eabc1ce8b17a0b7d21549049e53e24e
Cr-Commit-Position: refs/heads/master@{#308437}

[Eran Messeri, 2014-12-15 11:22:05]

eranm@chromium.org changed reviewers:
+ rsleevi@chromium.org

[Ryan Sleevi, 2014-12-15 21:15:00]

lgtm

[Eran Messeri, 2014-12-15 21:19:03]

The CQ bit was checked by eranm@chromium.org

[commit-bot: I haz the power, 2014-12-15 21:20:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/795013003/1

[commit-bot: I haz the power, 2014-12-15 22:17:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-15 22:19:03]

Patchset 1 (id:??) landed as
https://crrev.com/bce7c1b31eabc1ce8b17a0b7d21549049e53e24e
Cr-Commit-Position: refs/heads/master@{#308437}