Remove dead code in SafeBrowsingDatabaseManager.

Remove dead code in SafeBrowsingDatabaseManager.

SafeBrowsingDatabaseManager::LogPauseDelay() has been dead code since http://crrev.com/169608
when it was moved to UIManager it looks like.

BUG=None

Committed: https://crrev.com/ce6760690b52af662b5684f24dca6edc20832edf
Cr-Commit-Position: refs/heads/master@{#305107}

[gab, 2014-11-20 20:09:08]

gab@chromium.org changed reviewers:
+ mattm@chromium.org

[gab, 2014-11-20 20:09:08]

Matt PTAL, digging through safe_browsing code and cleaning up as I find things,
let me know if you'd like me to diversify my choice of owners (but AFAICT Scott
is away and Noe is mainly on security-team so you're the best match).

[mattm, 2014-11-20 22:27:34]

The CQ bit was checked by mattm@chromium.org

[mattm, 2014-11-20 22:27:34]

lgtm

[commit-bot: I haz the power, 2014-11-20 22:29:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/725113003/1

[commit-bot: I haz the power, 2014-11-20 23:14:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-20 23:14:59]

Patchset 1 (id:??) landed as
https://crrev.com/ce6760690b52af662b5684f24dca6edc20832edf
Cr-Commit-Position: refs/heads/master@{#305107}