Clean up RenderLayer paintOrderLists code

Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 1573 matching lines @@
         ec = INVALID_ACCESS_ERR;
         return 0;
     }
 
     RenderLayer* layer = toRenderBox(renderer)->layer();
     if (!layer) {
         ec = INVALID_ACCESS_ERR;
         return 0;
     }
 
-    return layer->paintOrderList(type);
+    Vector<RefPtr<Node> > nodes;
+    layer->computePaintOrderList(type, nodes);
+    return StaticNodeList::adopt(nodes);
 }
 
 PassRefPtr<NodeList> Internals::paintOrderListBeforePromote(Element* element, ExceptionCode& ec)
 {
     return paintOrderList(element, ec, RenderLayer::BeforePromote);
 }
 
 PassRefPtr<NodeList> Internals::paintOrderListAfterPromote(Element* element, ExceptionCode& ec)
 {
     return paintOrderList(element, ec, RenderLayer::AfterPromote);
@@ skipping 390 matching lines @@
 
     RenderObject* renderer = select->renderer();
     if (!renderer->isMenuList())
         return false;
 
     RenderMenuList* menuList = toRenderMenuList(renderer);
     return menuList->popupIsVisible();
 }
 
 }