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This reverts commit 016ff4b3.

Reason for revert: LoginCursorTest.CursorHidden is still failing:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/linux-chromeos-dbg/6897
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/28314

Original change's description:
> Reland "Enable powerwash shortcut in views-based login screen."
> 
> This reverts commit 14fd238a.
> Removes the chrome.send('showAddUser') in md_login.js to avoid a race
> between the powerwash dialog and the Gaia signin screen.
> 
> Bug: 837501
> Cq-Include-Trybots: luci.chromium.try:closure_compilation
> Change-Id: I7ab656ebe522cbd164073b73b3dd927cca7b1f13
> Reviewed-on: https://chromium-review.googlesource.com/1129384
> Commit-Queue: Quan Nguyen <qnnguyen@chromium.org>
> Reviewed-by: Jacob Dufault <jdufault@chromium.org>
> Reviewed-by: Dan Erat <derat@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#576306}

TBR=derat@chromium.org,dcheng@chromium.org,jdufault@chromium.org,qnnguyen@chromium.org

Change-Id: I7044802f815396b7c918f1153342d531122d8852
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 837501
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Reviewed-on: https://chromium-review.googlesource.com/1143206Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576446}