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

ash/common/wm_root_window_controller.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/wm_root_window_controller.h"
 
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shelf/shelf_layout_manager.h"
 #include "ash/common/shelf/shelf_widget.h"
 #include "ash/common/shelf/wm_shelf.h"
@@ skipping 197 matching lines @@
   }
 
   // Notify shell observers that the shelf has been created.
   // TODO(jamescook): Move this into WmShelf::InitializeShelf(). This will
   // require changing AttachedPanelWidgetTargeter's access to WmShelf.
   WmShell::Get()->NotifyShelfCreatedForRootWindow(GetWindow());
 
   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())
     return nullptr;
   return shelf_widget->status_area_widget()->system_tray();
 }
 
 WmWindow* WmRootWindowController::GetContainer(int container_id) {
   return root_->GetChildByShellWindowId(container_id);
 }
@@ skipping 355 matching lines @@
 }
 
 void WmRootWindowController::OnMenuClosed() {
   menu_runner_.reset();
   menu_model_adapter_.reset();
   menu_model_.reset();
   GetShelf()->UpdateVisibilityState();
 }
 
 }  // namespace ash