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This reverts commit 441c06d9.

Reason for revert: Reland changes after disabling test for MSan builds.
The root issue is a bug that causes a flaky initialization  behavior
in the <webview> element in MSan builds (https://crbug.com/1002560)

Also, added a new unit test from tobyhuang@ that was dependent on
the original reverted CL.

Original change's description:
> Revert "Automated tests for Add Supervision flow ChromeOS code"
>
> This reverts commit 9f7c76d0.
>
> Reason for revert:
> AddSupervisionBrowserTest.ShowConfirmSignoutDialog
> AddSupervisionBrowserTest.URLParameters
> failing on Linux ChromiumOS MSan Tests, see
> https://findit-for-me.appspot.com/waterfall/failure?url=https://build.chromium.org/p/chromium.memory/builders/Linux%20ChromiumOS%20MSan%20Tests/builds/15000
>
> Original change's description:
> > Automated tests for Add Supervision flow ChromeOS code
> >
> > This required modifying the classes under test, including
> > AddSupervisionHandler, AddSupervisionUI, and ConfirmSignoutDialog
> > to allow them to be tested.
> >
> > Bug:982543
> >
> > Change-Id: I3bebada137fe57a63ca090c788fa5a0cb317d22b
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771387
> > Commit-Queue: Danan S <danan@chromium.org>
> > Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#693320}
>
> TBR=michaelpg@chromium.org,danan@chromium.org
>
> Change-Id: Ibe6189ed52f32afb62cdfabbf890857e474de6ea
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 982543
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787417
> Reviewed-by: Olga Sharonova <olka@chromium.org>
> Commit-Queue: Olga Sharonova <olka@chromium.org>
> Auto-Submit: Olga Sharonova <olka@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#693571}

Change-Id: I4d2c19c229923a5bd1acb246f8e9d4d1b2ccb9af
Bug: 982543
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787613
Commit-Queue: Dan S <danan@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695835}