Revert of Revert of Enable telemetry unittests on Mac 10.9

Revert of Revert of Enable telemetry unittests on Mac 10.9 (patchset #1 id:1 of https://codereview.chromium.org/792683002/)

Reason for revert:
The failing test was disabled in https://codereview.chromium.org/789043003

Original issue's description:
> Revert of Enable telemetry unittests on Mac 10.9 (patchset #1 id:1 of https://codereview.chromium.org/779943004/)
>
> Reason for revert:
> Tests fail with a different error.
>
> Original issue's description:
> > Enable telemetry unittests on Mac 10.9
> >
> > The tests were fixed in https://codereview.chromium.org/789853003
> >
> > BUG=423688
> >
> > Committed: https://crrev.com/e0fe19f3e05e83e820be8a8e2850853bc0434b21
> > Cr-Commit-Position: refs/heads/master@{#307522}
>
> TBR=tonyg@chromium.org,phajdan.jr@chromium.org
> NOTREECHECKS=true
> NOTRY=true
> BUG=423688
>
> Committed: https://crrev.com/dbf34f1e5d36e433c9d30df974da8c5f6fa665e5
> Cr-Commit-Position: refs/heads/master@{#307553}

TBR=tonyg@chromium.org,phajdan.jr@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=423688
Committed: https://crrev.com/1e2366706b52428a3a6355864b6e9a845216ae3d
Cr-Commit-Position: refs/heads/master@{#307696}

[sullivan, 2014-12-10 14:34:34]

Created Revert of Revert of Enable telemetry unittests on Mac 10.9

[commit-bot: I haz the power, 2014-12-10 14:35:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/789233002/1

[commit-bot: I haz the power, 2014-12-10 14:35:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-10 14:36:26]

Patchset 1 (id:??) landed as
https://crrev.com/1e2366706b52428a3a6355864b6e9a845216ae3d
Cr-Commit-Position: refs/heads/master@{#307696}

[dvh, 2014-12-10 18:10:56]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/788263002/ by dvh@chromium.org.

The reason for reverting is: Telemetry tests still fails..