Revert of ES6 computed property names

Revert of ES6 computed property names (patchset #1 id:1 of https://codereview.chromium.org/807173002/)

Reason for revert:
Crashes Win32. It was not flake.

Original issue's description:
> ES6 computed property names
>
> This adds support for computed property names, under the flag
> --harmony-computed-property-names, for both object literals and
> classes.
>
> This is a revert of the revert, a76419f0f497db156eb1010e9b4be398951280cb with
> no changes. I cannot reproduce the issue on Win8.1 or WinXP. Letting the bots
> try again.
>
> BUG=v8:3754
> LOG=Y
> TBR=dslomov@chromium.org

TBR=dslomov@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=v8:3754
Committed: https://crrev.com/5f22fdd5ae60c7de27f165e673524863a6943ccc
Cr-Commit-Position: refs/heads/master@{#25853}

[arv (Not doing code reviews), 2014-12-16 19:37:45]

Created Revert of ES6 computed property names

[commit-bot: I haz the power, 2014-12-16 19:38:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/807033003/1

[commit-bot: I haz the power, 2014-12-16 19:38:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-17 10:14:37]

Patchset 1 (id:??) landed as
https://crrev.com/5f22fdd5ae60c7de27f165e673524863a6943ccc
Cr-Commit-Position: refs/heads/master@{#25853}