Revert of Disable slow BootstrapSandboxTest.DistributedNotifications_SandboxDeny

Revert of Disable slow BootstrapSandboxTest.DistributedNotifications_SandboxDeny (patchset #1 of https://codereview.chromium.org/498193002/)

Reason for revert:
Unclear reason for disable.

Original issue's description:
> Disable slow BootstrapSandboxTest.DistributedNotifications_SandboxDeny
> 
> TBR=rsesek
> 
> BUG=407066
> 
> Committed to pending queue: https://chromium.googlesource.com/chromium/src/+/f1bd7f7

TBR=phajdan.jr@chromium.org
BUG=407066
Committed: https://crrev.com/d05a25f0903ca4bf20e310319325997557e5b2e3
Cr-Commit-Position: refs/heads/master@{#292207}

[Robert Sesek, 2014-08-27 18:13:30]

Created Revert of Disable slow
BootstrapSandboxTest.DistributedNotifications_SandboxDeny

[commit-bot: I haz the power, 2014-08-27 18:14:18]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/rsesek@chromium.org/508873003/1

[commit-bot: I haz the power, 2014-08-27 19:08:16]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu_trigger...)

[commit-bot: I haz the power, 2014-08-27 19:32:24]

Committed patchset #1 (id:1) as d031dc3fbf099a4ea13d04d3094378f096765708

[commit-bot: I haz the power, 2014-09-10 02:53:32]

Patchset 1 (id:??) landed as
https://crrev.com/d05a25f0903ca4bf20e310319325997557e5b2e3
Cr-Commit-Position: refs/heads/master@{#292207}