Revert of Reland: chromeos: Fix shelf appearing at login screen under mash

ash/aura/wm_shell_aura.cc

Index: ash/aura/wm_shell_aura.cc
diff --git a/ash/aura/wm_shell_aura.cc b/ash/aura/wm_shell_aura.cc
index 1d27a92fcd70393081701550212cfe248153b724..1d99a96a81f487c382500c5864e004655cae1da0 100644
--- a/ash/aura/wm_shell_aura.cc
+++ b/ash/aura/wm_shell_aura.cc
@@ -318,15 +318,6 @@
   }
 }
 
-void WmShellAura::SessionStateChanged(session_manager::SessionState state) {
-  // Create the shelf if necessary.
-  WmShell::SessionStateChanged(state);
-
-  // Recreate the keyboard after initial login and after multiprofile login.
-  if (state == session_manager::SessionState::ACTIVE)
-    Shell::GetInstance()->CreateKeyboard();
-}
-
 void WmShellAura::OnDisplayConfigurationChanging() {
   for (auto& observer : display_observers_)
     observer.OnDisplayConfigurationChanging();