Revert of [Telemetry] Disable flaky smoothness.top_25 and testRepaint

Revert of [Telemetry] Disable flaky smoothness.top_25 and testRepaint (https://codereview.chromium.org/267343002/)

Reason for revert:
We expect the flake is fixed.

BUG=368767
TBR=caseq@chromium.org

Original issue's description:
> [Telemetry] Disable flaky smoothness.top_25 and testRepaint
> 
> BUG=368767
> TBR=dtu@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=268659

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=279772

[tonyg, 2014-06-25 14:45:22]

Created Revert of [Telemetry] Disable flaky smoothness.top_25 and testRepaint

[tonyg, 2014-06-25 14:46:24]

The CQ bit was checked by tonyg@chromium.org

[commit-bot: I haz the power, 2014-06-25 14:47:06]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tonyg@chromium.org/358643002/1

[tonyg, 2014-06-25 15:09:18]

The CQ bit was checked by tonyg@chromium.org

[commit-bot: I haz the power, 2014-06-25 15:10:27]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tonyg@chromium.org/358643002/90001

[commit-bot: I haz the power, 2014-06-25 17:10:11]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_chromium_x64_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_x64_rel/...)

[commit-bot: I haz the power, 2014-06-25 19:08:00]

Change committed as 279772