Roll leveldb to r80 / 1.17.

Roll leveldb to r80 / 1.17.

Changes that affect chrome:

- Changed local variable type from int to size_t. This fixes
  compiler warning to unblock env_chromium_unittests change:
  https://codereview.chromium.org/213303002

BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=268299

[cmumford, 2014-05-01 23:10:37]

dgrogan@chromium.org: Please review changes in 

darin@chromium.org: Please review changes in

[dgrogan, 2014-05-01 23:12:30]

lgtm

[darin (slow to review), 2014-05-02 07:48:59]

LGTM

[cmumford, 2014-05-02 15:52:49]

The CQ bit was checked by cmumford@chromium.org

[commit-bot: I haz the power, 2014-05-02 15:53:30]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/cmumford@chromium.org/264773009/1

[commit-bot: I haz the power, 2014-05-02 15:55:51]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-05-02 15:55:51]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium
  linux_chromium_chromeos_clang_dbg on tryserver.chromium
  linux_chromium_rel on tryserver.chromium

[cmumford, 2014-05-02 17:15:57]

The CQ bit was checked by cmumford@chromium.org

[commit-bot: I haz the power, 2014-05-02 17:16:44]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/cmumford@chromium.org/264773009/20001

[commit-bot: I haz the power, 2014-05-02 20:58:51]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-05-02 20:58:51]

Try jobs failed on following builders:
  win_chromium_rel on tryserver.chromium

[cmumford, 2014-05-05 16:13:18]

The CQ bit was checked by cmumford@chromium.org

[commit-bot: I haz the power, 2014-05-05 16:14:12]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/cmumford@chromium.org/264773009/40001

[commit-bot: I haz the power, 2014-05-05 23:04:34]

Change committed as 268299