Update V8 to version 4.9.271.

Update V8 to version 4.9.271.

Summary of changes available at:
https://chromium.googlesource.com/v8/v8/+log/56baa6c6..eecaedd7

Please follow these instructions for assigning/CC'ing issues:
https://github.com/v8/v8/wiki/Triaging%20issues

Please close rolling in case of a roll revert:
https://v8-roll.appspot.com/
This only works with a Google account.

TBR=hablich@chromium.org,machenbach@chromium.org,yangguo@chromium.org,vogelheim@chromium.org

Committed: https://crrev.com/bac3cf94c42f4c7d5316c98c160253891945db8c
Cr-Commit-Position: refs/heads/master@{#367103}

[v8-autoroll, 2015-12-29 20:02:27]

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

[commit-bot: I haz the power, 2015-12-29 20:03:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1553553002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1553553002/1

[commit-bot: I haz the power, 2015-12-29 21:21:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-29 21:21:56]

Description was changed from

==========
Update V8 to version 4.9.271.

Summary of changes available at:
https://chromium.googlesource.com/v8/v8/+log/56baa6c6..eecaedd7

Please follow these instructions for assigning/CC'ing issues:
https://github.com/v8/v8/wiki/Triaging%20issues

Please close rolling in case of a roll revert:
https://v8-roll.appspot.com/
This only works with a Google account.

TBR=hablich@chromium.org,machenbach@chromium.org,yangguo@chromium.org,vogelhe...
==========

to

==========
Update V8 to version 4.9.271.

Summary of changes available at:
https://chromium.googlesource.com/v8/v8/+log/56baa6c6..eecaedd7

Please follow these instructions for assigning/CC'ing issues:
https://github.com/v8/v8/wiki/Triaging%20issues

Please close rolling in case of a roll revert:
https://v8-roll.appspot.com/
This only works with a Google account.

TBR=hablich@chromium.org,machenbach@chromium.org,yangguo@chromium.org,vogelhe...

Committed: https://crrev.com/bac3cf94c42f4c7d5316c98c160253891945db8c
Cr-Commit-Position: refs/heads/master@{#367103}
==========

[commit-bot: I haz the power, 2015-12-29 21:21:56]

Patchset 1 (id:??) landed as
https://crrev.com/bac3cf94c42f4c7d5316c98c160253891945db8c
Cr-Commit-Position: refs/heads/master@{#367103}