Revert of Disallow subclassing Arrays.

Revert of Disallow subclassing Arrays. (patchset #3 id:40001 of https://codereview.chromium.org/962263002/)

Reason for revert:
Fails on nosnap build

Original issue's description:
> Disallow subclassing Arrays.
>
> R=rossberg@chromium.org,arv@chromium.org
> BUG=v8:3930
> LOG=Y
>
> Committed: https://crrev.com/87f3e08e72510ee5544e82bb7ad39b2b5f001ad3
> Cr-Commit-Position: refs/heads/master@{#26925}

TBR=arv@chromium.org,rossberg@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:3930
Committed: https://crrev.com/47b6e27317c4b28b6a58299962de0ae96dbc905d
Cr-Commit-Position: refs/heads/master@{#26930}

[Dmitry Lomov (no reviews), 2015-02-27 22:26:02]

Created Revert of Disallow subclassing Arrays.

[commit-bot: I haz the power, 2015-02-27 22:26:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/965053002/1

[commit-bot: I haz the power, 2015-02-27 22:26:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-27 22:26:44]

Patchset 1 (id:??) landed as
https://crrev.com/47b6e27317c4b28b6a58299962de0ae96dbc905d
Cr-Commit-Position: refs/heads/master@{#26930}