Revert of Disable flaky browser tests on Mac.

Revert of Disable flaky browser tests on Mac. (patchset #1 id:1 of https://codereview.chromium.org/1868863003/ )

Reason for revert:
Flakiness should have been fixed. See bug.

Original issue's description:
> Disable flaky browser tests on Mac.
>
> BUG=599484
> TBR=tommycli@chromium.org
>
> Committed: https://crrev.com/bce1b56007d9e70b8b926781b2a3deb340046b83
> Cr-Commit-Position: refs/heads/master@{#385664}

TBR=loyso@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=599484
Committed: https://crrev.com/0983d3b2372bd46ec38d4ebc0b4fa06f286ff4d9
Cr-Commit-Position: refs/heads/master@{#421355}

[tommycli, 2016-09-27 21:38:05]

The CQ bit was checked by tommycli@chromium.org

[tommycli, 2016-09-27 21:38:06]

Created Revert of Disable flaky browser tests on Mac.

[commit-bot: I haz the power, 2016-09-27 21:38:27]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-27 22:08:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-27 22:10:46]

Description was changed from

==========
Revert of Disable flaky browser tests on Mac. (patchset #1 id:1 of
https://codereview.chromium.org/1868863003/ )

Reason for revert:
Flakiness should have been fixed. See bug.

Original issue's description:
> Disable flaky browser tests on Mac.
> 
> BUG=599484
> TBR=tommycli@chromium.org
> 
> Committed: https://crrev.com/bce1b56007d9e70b8b926781b2a3deb340046b83
> Cr-Commit-Position: refs/heads/master@{#385664}

TBR=loyso@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=599484
==========

to

==========
Revert of Disable flaky browser tests on Mac. (patchset #1 id:1 of
https://codereview.chromium.org/1868863003/ )

Reason for revert:
Flakiness should have been fixed. See bug.

Original issue's description:
> Disable flaky browser tests on Mac.
>
> BUG=599484
> TBR=tommycli@chromium.org
>
> Committed: https://crrev.com/bce1b56007d9e70b8b926781b2a3deb340046b83
> Cr-Commit-Position: refs/heads/master@{#385664}

TBR=loyso@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=599484

Committed: https://crrev.com/0983d3b2372bd46ec38d4ebc0b4fa06f286ff4d9
Cr-Commit-Position: refs/heads/master@{#421355}
==========

[commit-bot: I haz the power, 2016-09-27 22:10:47]

Patchset 1 (id:??) landed as
https://crrev.com/0983d3b2372bd46ec38d4ebc0b4fa06f286ff4d9
Cr-Commit-Position: refs/heads/master@{#421355}

[loyso (OOO), 2016-09-28 00:17:21]

I'm not sure that the flakiness is fixed. The bug is blocked on
https://bugs.chromium.org/p/chromium/issues/detail?id=462580
That issue still exists.