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This reverts commit ddd08c52.

Reason for revert: This CL is likly the cause for test failure DemoSetupArcSupportedTest.OnlineSetupFlowErrorDefault in builder Linux Chromium OS ASan LSan Tests (1) starting from
https://ci.chromium.org/ui/p/chromium/builders/ci/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20(1)/39313/blamelist

Original change's description:
> OOBE: Arc-ToS Improvements
>
> Migrate ArcToSScreen to multistep behavior.
> Get rid of display: none; and display: block;
>
> Bug: 1156667
> Change-Id: I4c2fc425edd4883c5edfceb0a5a9f67a6227de7b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2603744
> Commit-Queue: Ossama Mahmoud <osamafathy@google.com>
> Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
> Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#844554}

TBR=antrim@chromium.org,rsorokin@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com,osamafathy@google.com

Change-Id: I62973f98fccb5086b852879395d04f4a3050c244
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1156667
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2636099Reviewed-by: Maggie Cai <mxcai@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844643}