ES6: Fix GetIterator

ES6: Fix GetIterator

After further spec reading it turns out that we should not do ToObject
on the iterable.

BUG=None
LOG=N
R=adamk

Committed: https://crrev.com/fa1523ea6e2df562c39fee929b905ff5f7773e62
Cr-Commit-Position: refs/heads/master@{#26786}

[arv (Not doing code reviews), 2015-02-20 17:00:24]

PTAL

[adamk, 2015-02-20 19:54:09]

lgtm

[arv (Not doing code reviews), 2015-02-20 20:05:51]

The CQ bit was checked by arv@chromium.org

[commit-bot: I haz the power, 2015-02-20 20:06:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/941313003/1

[commit-bot: I haz the power, 2015-02-20 20:07:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-20 20:07:16]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-20 20:07:33]

Patchset 1 (id:??) landed as
https://crrev.com/fa1523ea6e2df562c39fee929b905ff5f7773e62
Cr-Commit-Position: refs/heads/master@{#26786}