Revert "Reland "Adds parental handoff login screen in oobe.""

This reverts commit 27e795c.

Reason for revert: Sorry for another revert, but this is still causing flake. See https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome/9353 . Specifically:
../../content/public/test/browser_test_base.cc:702: Failure
Failed
RunLoop::Run() timed out.
Stack trace:
#0 0x56324b6c5e50 base::internal::Invoker<>::Run()
#1 0x56324b623b4f base::(anonymous namespace)::OnRunLoopTimeout()
#2 0x56324b6249e3 base::internal::Invoker<>::RunOnce()
#3 0x5632492266ab base::internal::CancelableCallbackImpl<>::ForwardOnce<>()
#4 0x56324b63bc46 base::TaskAnnotator::RunTask()
#5 0x56324b64c845 base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::DoWorkImpl()
chromium#6 0x56324b64c588 base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::DoWork()
#7 0x56324b69fb29 base::MessagePumpLibevent::Run()
#8 0x56324b64cf9a base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::Run()
#9 0x56324b62363e base::RunLoop::Run()
#10 0x5632483f1f23 chromeos::EduCoexistenceLoginBrowserTest::WaitForScreenExit()
#11 0x563248402206 chromeos::ParentalHandoffScreenBrowserTest_RegularUserLogin_Test::RunTestOnMainThread()
#12 0x56324bae8dd1 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()
#13 0x56324b6fff04 ChromeBrowserMainParts::PreMainMessageLoopRunImpl()
#14 0x56324b6ff3b9 ChromeBrowserMainParts::PreMainMessageLoopRun()
#15 0x563248bf574e chromeos::ChromeBrowserMainPartsChromeos::PreMainMessageLoopRun()
#16 0x563249bdf3b0 content::BrowserMainLoop::PreMainMessageLoopRun()
#17 0x563249f3668a content::StartupTaskRunner::RunAllTasksNow()
#18 0x563249bde45b content::BrowserMainLoop::CreateStartupTasks()
#19 0x563249be0bba content::BrowserMainRunnerImpl::Initialize()
#20 0x563249bdcbd2 content::BrowserMain()
#21 0x56324b198740 content::RunBrowserProcessMain()
#22 0x56324b1995d1 content::ContentMainRunnerImpl::RunServiceManager()
#23 0x56324b199234 content::ContentMainRunnerImpl::Run()
#24 0x56324a5c8687 content::RunContentProcess()
#25 0x56324a5c8c16 content::ContentMain()
#26 0x56324bae8a00 content::BrowserTestBase::SetUp()
#27 0x56324b5d8620 InProcessBrowserTest::SetUp()

Original change's description:
> Reland "Adds parental handoff login screen in oobe."
>
> This is a reland of dca1afe
>
> This is an interesting failure point due to the difference between
> official builds and non official builds. In official builds, the
> Sync Consent screen is shown and it will not exit until we interact
> with it. The waiters timeout waiting for the Parental Handoff Screen
> to be shown.
>
> Original change's description:
>
> > Adds parental handoff login screen in oobe.
> >
> > The description and mock can be seen in the comments in the bug report.
> >
> > Bug: 1134567
> > Change-Id: I2ecd7c72629dc96dfbc054f747c6cb2508210709
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466618
> > Commit-Queue: Yilkal Abe <yilkal@chromium.org>
> > Reviewed-by: Aga Wronska <agawronska@chromium.org>
> > Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
> > Reviewed-by: Jesse Doherty <jwd@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#819158}
>
> Bug: 1134567
> Change-Id: Id4d8c15363579799da14a3f3ed0a285e61dde5d6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2489756
> Commit-Queue: Yilkal Abe <yilkal@chromium.org>
> Reviewed-by: Aga Wronska <agawronska@chromium.org>
> Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
> Reviewed-by: Jesse Doherty <jwd@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#820388}

TBR=jwd@chromium.org,rsorokin@chromium.org,agawronska@chromium.org,yilkal@chromium.org

Change-Id: I6febf7f06a0d5d7a072be1e50aaa9cc2a4d3c217
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1134567
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495423
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820489}

chrome/app/chromeos_strings.grdp

@@ -954,17 +954,6 @@
     Please retry. If you see this error again please contact your support representative.
   </message>
 
-  <!-- Strings for parental handoff login screen -->
-  <message name="IDS_LOGIN_PARENTAL_HANDOFF_SCREEN_TITLE" desc="Title of screen which tells user that the parent can handoff the device to supervised user.">
-    Now it's <ph name="SUPERVISED_USER_NAME">$1<ex>Child 1</ex></ph>'s turn
-  </message>
-  <message name="IDS_LOGIN_PARENTAL_HANDOFF_SCREEN_SUBTITLE" desc="Subtitle of screen which tells user that the parent can handoff the device to supervised user.">
-    You can hand this Chromebook to <ph name="SUPERVISED_USER_NAME">$1<ex>Child 1</ex></ph>. Setup is almost done, then it's time to explore.
-  </message>
-  <message name="IDS_LOGIN_PARENTAL_HANDOFF_SCREEN_NEXT_BUTTON" desc="Next button of parental handoff screen">
-    Next
-  </message>
-
   <!-- Strings for family link notice screen -->
   <message name="IDS_LOGIN_FAMILY_LINK_NOTICE_SCREEN_TITLE" desc="Title of the screen which tells user they can add parental control later.">
     Add parental controls after setup

chrome/browser/chromeos/BUILD.gn

@@ -1745,8 +1745,6 @@ source_set("chromeos") {
     "login/screens/network_screen.h",
     "login/screens/packaged_license_screen.cc",
     "login/screens/packaged_license_screen.h",
-    "login/screens/parental_handoff_screen.cc",
-    "login/screens/parental_handoff_screen.h",
     "login/screens/pin_setup_screen.cc",
     "login/screens/pin_setup_screen.h",
     "login/screens/recommend_apps/fake_recommend_apps_fetcher.cc",

chrome/browser/chromeos/login/debug_overlay_browsertest.cc

@@ -22,8 +22,8 @@ constexpr char kDebugButton[] = "invokeDebuggerButton";
 constexpr char kDebugOverlay[] = "debuggerOverlay";
 constexpr char kScreensPanel[] = "DebuggerPanelScreens";
 
-constexpr int kOobeScreensCount = 38;
-constexpr int kLoginScreensCount = 33;
+constexpr int kOobeScreensCount = 37;
+constexpr int kLoginScreensCount = 32;
 
 std::string ElementsInPanel(const std::string& panel) {
   return base::StrCat({"$('", panel, "').children.length"});