Revert "Disable flaky ChromeDriverTest"

This reverts commit 1748ac49d625915b7a1a11798c7efea9fbbc8ac9.

Reason for revert: Cause of the flakiness has already been fixed

Original change's description:
> Disable flaky ChromeDriverTest
> 
> TBR: khachatryan@chromium.org
> Bug: 865842
> Change-Id: I33180c2c852a8da94cf735a1437eac3748203153
> Reviewed-on: https://chromium-review.googlesource.com/1151027
> Reviewed-by: Yoichi Osato <yoichio@chromium.org>
> Commit-Queue: Yoichi Osato <yoichio@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#578210}

TBR=yoichio@chromium.org

Change-Id: Ib630eb7748189190c9e49809f1730ca0ca5f04ec
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 865842
Reviewed-on: https://chromium-review.googlesource.com/1152307
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578457}
1 file changed