Revert of [Android] Disable PrerenderTest.testNoPrerender.

Revert of [Android] Disable PrerenderTest.testNoPrerender. (patchset #1 id:1 of https://codereview.chromium.org/1422843003/ )

Reason for revert:
Symptom, not the cause. Reenabling since it doesn't appear to be otherwise flaky while I continue to investigate.

Original issue's description:
> [Android] Disable PrerenderTest.testNoPrerender.
>
> BUG=547941
> TBR=tedchoc@chromium.org
>
> Committed: https://crrev.com/2ff168ab8486a226a90a7f83d13a1885221efd33
> Cr-Commit-Position: refs/heads/master@{#356182}

TBR=tedchoc@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=547941
Committed: https://crrev.com/93b3bbd07c01730543b99637b9575f0e07e6f509
Cr-Commit-Position: refs/heads/master@{#356319}

[jbudorick, 2015-10-27 17:03:06]

Created Revert of [Android] Disable PrerenderTest.testNoPrerender.

[commit-bot: I haz the power, 2015-10-27 17:03:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1424033004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1424033004/1

[commit-bot: I haz the power, 2015-10-27 17:05:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-27 17:05:59]

Patchset 1 (id:??) landed as
https://crrev.com/93b3bbd07c01730543b99637b9575f0e07e6f509
Cr-Commit-Position: refs/heads/master@{#356319}