Revert of Make dates default to the local timezone if none specified (https://codereview.chromium.…

Revert of Make dates default to the local timezone if none specified  (https://codereview.chromium.org/1229903004/)

Even though the change is ES6 spec compliant, we decided to revert
to be consistent with other browsers and work on fixing the spec.

Original issue's description:
> Make dates default to the local timezone if none specified
>
> In ES5, dates were supposed to default to UTC if no timezone was specified. However, this changed in ES6, which specified that dates should be in the local timezone if no timezone was specified. This CL updates our behavior to match that part of the ES6 spec.

> BUG=chromium:391730, v8:4242
> LOG=Y

> Committed: https://crrev.com/f06754a8e1d305a43560705f6c167d85d40e602d
> Cr-Commit-Position: refs/heads/master@{#29854}

BUG=chromium:543320, chromium:539813
LOG=NO

Committed: https://crrev.com/dd3f1ecf719afd21b4c695c776b4da2fb494ef92
Cr-Commit-Position: refs/heads/master@{#31295}

[ulan, 2015-10-15 11:49:25]

ulan@chromium.org changed reviewers:
+ hichris123@gmail.com, rossberg@chromium.org

[ulan, 2015-10-15 11:49:26]

PTAL

[rossberg, 2015-10-15 11:51:54]

lgtm

[ulan, 2015-10-15 11:52:11]

The CQ bit was checked by ulan@chromium.org

[commit-bot: I haz the power, 2015-10-15 11:52:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1403153003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1403153003/20001

[commit-bot: I haz the power, 2015-10-15 12:17:59]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-10-15 12:18:27]

Patchset 2 (id:??) landed as
https://crrev.com/dd3f1ecf719afd21b4c695c776b4da2fb494ef92
Cr-Commit-Position: refs/heads/master@{#31295}

[hichris123, 2015-10-15 19:49:45]

Sounds good. Didn't realize FF had differing behavior, sorry.

[mj1856, 2015-10-16 03:52:34]

No... Please don't unwind this!  It is a necessary and much anticipated new
feature of ES6.  See my comments in the issue.