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This reverts commit bfaedb07.

Reason for revert: I think I've found the culprit CL that caused these test failures in the first place (https://chromium-review.googlesource.com/c/chromium/src/+/2537580), so I'm re-enabling these tests to see if they still fail.

See https://bugs.chromium.org/p/chromium/issues/detail?id=1148771#c3 for more details of the investigation.

Original change's description:
> Sheriff: Disable tests in ExistingUserControllerActiveDirectoryTest
>
> Bug: 1148771
> Change-Id: I676dd86028dbca3f39661aa2b35202facf880281
> Tbr: alemate@chromium.org
> No-Try: True
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536978
> Reviewed-by: Adithya Srinivasan <adithyas@chromium.org>
> Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#827245}

TBR=alemate@chromium.org,adithyas@chromium.org

Change-Id: Id51b3e6102219db51af7dc030d9e8256838de7c4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1148771
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537581Reviewed-by: Scott Little <sclittle@chromium.org>
Commit-Queue: Scott Little <sclittle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827324}