Revert of Replaced BackgroundAnimator with ShelfBackgroundAnimator.

ash/root_window_controller.cc

 // Copyright (c) 2012 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/root_window_controller.h"
 
 #include <queue>
 #include <vector>
 
 #include "ash/aura/aura_layout_manager_adapter.h"
@@ skipping 478 matching lines @@
 void RootWindowController::ShowShelf() {
   if (!shelf_widget_->shelf())
     return;
   shelf_widget_->shelf()->SetVisible(true);
   shelf_widget_->status_area_widget()->Show();
 }
 
 void RootWindowController::CreateShelf() {
   if (shelf_widget_->shelf())
     return;
-  shelf_widget_->CreateShelf();
+  shelf_widget_->CreateShelf(wm_shelf_aura_.get());
 
   if (panel_layout_manager_)
     panel_layout_manager_->SetShelf(wm_shelf_aura_.get());
   if (docked_layout_manager_) {
     docked_layout_manager_->SetShelf(wm_shelf_aura_.get());
     if (shelf_widget_->shelf_layout_manager())
       docked_layout_manager_->AddObserver(
           shelf_widget_->shelf_layout_manager());
   }
 
@@ skipping 468 matching lines @@
     aura::Window* primary_root_window = Shell::GetInstance()
                                             ->window_tree_host_manager()
                                             ->GetPrimaryRootWindow();
     return GetRootWindowSettings(primary_root_window)->controller;
   }
 
   return GetRootWindowSettings(root_window)->controller;
 }
 
 }  // namespace ash