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

ash/common/wm_root_window_controller.cc

Index: ash/common/wm_root_window_controller.cc
diff --git a/ash/common/wm_root_window_controller.cc b/ash/common/wm_root_window_controller.cc
index f2851f6ac646bf4e8585bb61907f301b00bdac32..ebe7418df96caa8f552ba27737336cb5fe0a84dd 100644
--- a/ash/common/wm_root_window_controller.cc
+++ b/ash/common/wm_root_window_controller.cc
@@ -215,6 +215,15 @@ void WmRootWindowController::CreateShelf() {
   shelf->shelf_widget()->PostCreateShelf();
 }
 
+void WmRootWindowController::ShowShelf() {
+  WmShelf* shelf = GetShelf();
+  if (!shelf->IsShelfInitialized())
+    return;
+  // TODO(jamescook): Move this into WmShelf.
+  shelf->shelf_widget()->SetShelfVisibility(true);
+  shelf->shelf_widget()->status_area_widget()->Show();
+}
+
 SystemTray* WmRootWindowController::GetSystemTray() {
   ShelfWidget* shelf_widget = GetShelf()->shelf_widget();
   if (!shelf_widget || !shelf_widget->status_area_widget())