Update V8 to version 3.31.15 (based on 5a494cf00ca4626758cc41e0ca800ebb0bff3a9b).

Update V8 to version 3.31.15 (based on 5a494cf00ca4626758cc41e0ca800ebb0bff3a9b).

TBR=machenbach@chromium.org

Committed: https://crrev.com/b63a3757326d1f045f6588a7ea6b267030be162e
Cr-Commit-Position: refs/heads/master@{#305082}

[v8-autoroll, 2014-11-20 20:04:12]

The CQ bit was checked by v8-autoroll@chromium.org

[commit-bot: I haz the power, 2014-11-20 20:05:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/749583002/1

[commit-bot: I haz the power, 2014-11-20 20:05:09]

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

[commit-bot: I haz the power, 2014-11-20 20:05:10]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Michael Achenbach, 2014-11-20 20:36:59]

lgtm

[Michael Achenbach, 2014-11-20 20:37:03]

The CQ bit was checked by machenbach@chromium.org

[commit-bot: I haz the power, 2014-11-20 20:38:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/749583002/1

[commit-bot: I haz the power, 2014-11-20 21:52:55]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-20 21:53:30]

Patchset 1 (id:??) landed as
https://crrev.com/b63a3757326d1f045f6588a7ea6b267030be162e
Cr-Commit-Position: refs/heads/master@{#305082}