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This reverts commit 98d00374.

Reason for revert:
Both of these are failing on MSAN:
SigninReauthViewControllerBrowserTest.CancelReauthDialog
SigninReauthViewControllerBrowserTest.ConfirmReauthDialog

https://ci.chromium.org/p/chromium/builders/ci/Linux%20MSan%20Tests

https://ci.chromium.org/p/chromium/builders/ci/Linux%20MSan%20Tests/24165

https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8878588233120522160/+/steps/browser_tests/0/logs/Deterministic_failure:_SigninReauthViewControllerBrowserTest.CancelReauthDialog__status_CRASH_/0

Original change's description:
> [signin] Add browser tests for the reauth dialog
> 
> This CL adds tests for the first step of the reauth flow, the reauth
> confirmation dialog. The tests check that clicking on all buttons
> produces expected results.
> 
> The tests for the second step of the reauth flow will be added in
> follow-up CLs.
> 
> Bug: 1045515
> Change-Id: I4266f29ea03080d3d6612099a0b9a49cff5cdf09
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2219897
> Reviewed-by: David Roger <droger@chromium.org>
> Commit-Queue: Alex Ilin <alexilin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#774122}

TBR=droger@chromium.org,alexilin@chromium.org

Change-Id: I08bfa073e1b51c4dbb3125232cc4b60880deb293
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1045515
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2227932Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774447}