Revert of [Mac] Shut down connections to WindowServer before engaging the sandbox.

Revert of [Mac] Shut down connections to WindowServer before engaging the sandbox. (patchset #1 id:20001 of https://codereview.chromium.org/561833006/)

Reason for revert:
Your patch might break quite a number of webkit tests:
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.8%20%28retina%29/builds/19050
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.7/builds/31462

Original issue's description:
> [Mac] Shut down connections to WindowServer before engaging the sandbox.
> 
> The connection is only needed during sandbox warmup to initialize the default
> color space. It was formerly needed by scrollbar NSAnimations, but that was
> replaced via https://codereview.chromium.org/529103002/.
> 
> A similar CL was landed and reverted:
> https://chromium.googlesource.com/chromium/src.git/+/53ffdf90f4646dbde8df72007fbdc97f3f0220de
> 
> BUG=397642, 306348
> TEST=Manually tested on 10.6-10.10.
> 
> Committed: https://crrev.com/f3198fb3fc64878b8feb88cfae28ddb7e8bd71ec
> Cr-Commit-Position: refs/heads/master@{#294382}

TBR=jeremy@chromium.org,rsesek@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=397642, 306348

[jianli, 2014-09-11 18:13:23]

Created Revert of [Mac] Shut down connections to WindowServer before engaging
the sandbox.

[commit-bot: I haz the power, 2014-09-11 18:19:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/561033003/1

[Robert Sesek, 2014-09-11 18:20:12]

The CQ bit was unchecked by rsesek@chromium.org

[Robert Sesek, 2014-09-11 18:20:16]

On 2014/09/11 18:19:52, I haz the power (commit-bot) wrote:
> CQ is trying da patch. Follow status at
>  https://chromium-cq-status.appspot.com/patchset/561033003/1

This is already done.

[Robert Sesek, 2014-09-11 18:20:26]

not lgtm

[commit-bot: I haz the power, 2014-09-11 18:21:16]

The CQ bit was unchecked by commit-bot@chromium.org