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This reverts commit b0278053.

Reason for revert: UserAddingScreenTest.ScreenVisibility has been
flaky since this landed:

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=UserAddingScreenTest.ScreenVisibility

[28936:28936:0617/213745.316026:FATAL:accelerator_manager.cc(32)] Check failed: !base::ContainsValue(targets, target). Registering the same target multiple times
#0 0x000004980f5c base::debug::StackTrace::StackTrace()
#1 0x000004902b4b logging::LogMessage::~LogMessage()
#2 0x000005857d49 ui::AcceleratorManager::Register()
#3 0x000001ca3442 chromeos::WebUILoginView::WebUILoginView()
#4 0x000001c9a51c chromeos::LoginDisplayHostWebUI::InitLoginWindowAndView()
#5 0x000001c98cc5 chromeos::LoginDisplayHostWebUI::OnStartUserAdding()
#6 0x000001ca20c7 chromeos::(anonymous namespace)::UserAddingScreenImpl::Start()
#7 0x0000015dfd1c chromeos::UserAddingScreenTest_ScreenVisibility_Test::RunTestOnMainThread()
#8 0x000004f449b7 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()

Original change's description:
> Support feedback keyboard shortcut in views login screen.
>
> This CL supports alt+shift+i to open the feedback dialog in views login
> screen.
>
> Bug: 852242
> Change-Id: I9a285c6929fd2302d22f90fbefbb32bcd814359d
> Reviewed-on: https://chromium-review.googlesource.com/1102035
> Reviewed-by: Tom Sepez <tsepez@chromium.org>
> Reviewed-by: Jacob Dufault <jdufault@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Commit-Queue: Xiaoyin Hu <xiaoyinh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#567829}

TBR=xiyuan@chromium.org,tsepez@chromium.org,jdufault@chromium.org,xiaoyinh@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 852242, 853445
Change-Id: I21afadf31af3c9ae8e04a30f6021b928efde43f8
Reviewed-on: https://chromium-review.googlesource.com/1103957
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567935}