Revert "chromeos: Fix shelf appearing at login screen under mash"

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index e45191092c0a50b5ca9b2a3e2d6b2b3a825538c9..fcf7dafa69a26da7fdf3d31ff9c440687f6eb7fb 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -271,6 +271,11 @@ void Shell::OnLoginStateChanged(LoginStatus status) {
     observer.OnLoginStateChanged(status);
 }
 
+void Shell::OnLoginUserProfilePrepared() {
+  wm_shell_->CreateShelf();
+  CreateKeyboard();
+}
+
 void Shell::OnAppTerminating() {
   for (auto& observer : *wm_shell_->shell_observers())
     observer.OnAppTerminating();