Revert of exclude BrowserOptionsOverlayWebUITest.testNavigationInBackground on drmemory bot

Revert of exclude failing test BrowserOptionsOverlayWebUITest.testNavigationInBackground on drmemory bot (patchset #1 of https://codereview.chromium.org/470813002/)

Reason for revert:
Test has been patched.

Original issue's description:
> exclude failing test BrowserOptionsOverlayWebUITest.testNavigationInBackground on drmemory bot
>
> BUG=403627
> TBR=michaelpg@chromium.org
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=289441

BUG=403627
Committed: https://crrev.com/975b48d92b63f1e71a4239e22d9e88cd7002463e
Cr-Commit-Position: refs/heads/master@{#297260}

[michaelpg, 2014-08-20 22:47:54]

Created Revert of exclude failing test
BrowserOptionsOverlayWebUITest.testNavigationInBackground on drmemory bot

[michaelpg, 2014-09-16 19:47:11]

Patchset #1 (id:1) has been deleted

[michaelpg, 2014-09-16 19:47:16]

Patchset #1 (id:40001) has been deleted

[michaelpg, 2014-09-29 18:52:24]

michaelpg@chromium.org changed reviewers:
+ oshima@chromium.org

[michaelpg, 2014-09-29 18:53:06]

Apparently browser_tests can't be tested on a DrMemory bot, and I haven't seen
the test fail on my local Windows machine. But hopefully the patch to the test
will suffice.

[oshima, 2014-09-29 18:59:13]

lgtm

thank you for heads up.

[michaelpg, 2014-09-29 19:33:15]

The CQ bit was checked by michaelpg@chromium.org

[commit-bot: I haz the power, 2014-09-29 19:34:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/495803002/140001

[commit-bot: I haz the power, 2014-09-29 21:08:46]

Committed patchset #5 (id:140001) as 9fa63babfa18af4a909fbf7beac8198341f42287

[commit-bot: I haz the power, 2014-09-29 21:12:19]

Patchset 5 (id:??) landed as
https://crrev.com/975b48d92b63f1e71a4239e22d9e88cd7002463e
Cr-Commit-Position: refs/heads/master@{#297260}