Revert of [test262-es6] Temporary disable some tests

Revert of [test262-es6] Temporary disable some tests (patchset #1 id:1 of https://codereview.chromium.org/1176573002/)

Reason for revert:
[Sheriff] Prepares revert of https://codereview.chromium.org/1136553008

Original issue's description:
> [test262-es6] Temporary disable some tests
>
> These tests have issues with our harness.
>
> Upstream fix: https://github.com/tc39/test262/pull/309
>
> BUG=N
> LOG=N
> TBR=machenbach@chromium.org
>
> Committed: https://crrev.com/eed7363a0da0f21c3eee6c052507299d9b707462
> Cr-Commit-Position: refs/heads/master@{#28881}

TBR=arv@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=N

Committed: https://crrev.com/d3b42573d144fb834e0bba4b02510fd77c0e9fc0
Cr-Commit-Position: refs/heads/master@{#28889}

[Michael Achenbach, 2015-06-10 06:35:08]

Created Revert of [test262-es6] Temporary disable some tests

[commit-bot: I haz the power, 2015-06-10 06:35:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1169903006/1

[commit-bot: I haz the power, 2015-06-10 06:35:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-10 06:35:53]

Patchset 1 (id:??) landed as
https://crrev.com/d3b42573d144fb834e0bba4b02510fd77c0e9fc0
Cr-Commit-Position: refs/heads/master@{#28889}