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This reverts commit fc684f1c.

Reason for revert: TestDemoModeAcceptEula failures on ChromeOs

Original change's description:
> Fix race conditions in OobeConfiguration tests
> 
> Explicitly shut down LoginDisplayHost in OOBEConfigurationTests
> It should remove flakiness upon shutdown.
> 
> Also Fix race condition in setting up demo mode (reason for previous revert).
> 
> Reland of https://chromium-review.googlesource.com/c/chromium/src/+/1934342
> 
> Bug: 997685
> Change-Id: I0cb8f084484395a13bc3b29e8f1b7150cada8403
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1942339
> Commit-Queue: Denis Kuznetsov [CET] <antrim@chromium.org>
> Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#720207}

TBR=antrim@chromium.org,rsorokin@chromium.org

Change-Id: I3834c984a692e0e6774832a1b98425809458ce2b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 997685, 1029531
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1943536Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720268}