Revert of Disable flaky tests in ChildTracingTest on Android.

Revert of Disable flaky tests in ChildTracingTest on Android. (patchset #1 id:1 of https://codereview.chromium.org/2432443003/ )

Reason for revert:
Fix in place for issue that introduced flakiness of these tests.

Original issue's description:
> Disable flaky tests in ChildTracingTest on Android.
>
> BUG=656729
> TBR=jbauman@chromium.org
>
> Committed: https://crrev.com/356f59fca3ff5b0e1d82d0a85087c9628154682a
> Cr-Commit-Position: refs/heads/master@{#425988}

TBR=guidou@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=656729
Committed: https://crrev.com/170d17d3be602605691146d3f2e3675d52334bbc
Cr-Commit-Position: refs/heads/master@{#431246}

[perezju, 2016-11-10 13:49:08]

The CQ bit was checked by perezju@chromium.org

[perezju, 2016-11-10 13:49:08]

Created Revert of Disable flaky tests in ChildTracingTest on Android.

[commit-bot: I haz the power, 2016-11-10 13:49:22]

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, 2016-11-10 14:09:47]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-10 14:13:29]

Description was changed from

==========
Revert of Disable flaky tests in ChildTracingTest on Android. (patchset #1 id:1
of https://codereview.chromium.org/2432443003/ )

Reason for revert:
Fix in place for issue that introduced flakiness of these tests.

Original issue's description:
> Disable flaky tests in ChildTracingTest on Android.
> 
> BUG=656729
> TBR=jbauman@chromium.org
> 
> Committed: https://crrev.com/356f59fca3ff5b0e1d82d0a85087c9628154682a
> Cr-Commit-Position: refs/heads/master@{#425988}

TBR=guidou@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=656729
==========

to

==========
Revert of Disable flaky tests in ChildTracingTest on Android. (patchset #1 id:1
of https://codereview.chromium.org/2432443003/ )

Reason for revert:
Fix in place for issue that introduced flakiness of these tests.

Original issue's description:
> Disable flaky tests in ChildTracingTest on Android.
>
> BUG=656729
> TBR=jbauman@chromium.org
>
> Committed: https://crrev.com/356f59fca3ff5b0e1d82d0a85087c9628154682a
> Cr-Commit-Position: refs/heads/master@{#425988}

TBR=guidou@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=656729

Committed: https://crrev.com/170d17d3be602605691146d3f2e3675d52334bbc
Cr-Commit-Position: refs/heads/master@{#431246}
==========

[commit-bot: I haz the power, 2016-11-10 14:13:30]

Patchset 1 (id:??) landed as
https://crrev.com/170d17d3be602605691146d3f2e3675d52334bbc
Cr-Commit-Position: refs/heads/master@{#431246}