Revert of Moving HitTest function to DeprecatedPaintLayerStackingNode.

Source/modules/accessibility/AXLayoutObject.cpp

 /*
 * Copyright (C) 2008 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.
 * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 1487 matching lines @@
 
 AXObject* AXLayoutObject::accessibilityHitTest(const IntPoint& point) const
 {
     if (!m_layoutObject || !m_layoutObject->hasLayer())
         return 0;
 
     DeprecatedPaintLayer* layer = toLayoutBox(m_layoutObject)->layer();
 
     HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active);
     HitTestResult hitTestResult = HitTestResult(request, point);
-    layer->stackingNode()->hitTest(hitTestResult);
+    layer->hitTest(hitTestResult);
     if (!hitTestResult.innerNode())
         return 0;
 
     Node* node = hitTestResult.innerNode();
 
     // Allow the hit test to return media control buttons.
     if (node->isInShadowTree() && (!isHTMLInputElement(*node) || !node->isMediaControlElement()))
         node = node->shadowHost();
 
     if (isHTMLAreaElement(node))
@@ skipping 965 matching lines @@
         if (label && label->layoutObject()) {
             LayoutRect labelRect = axObjectCache()->getOrCreate(label)->elementRect();
             result.unite(labelRect);
         }
     }
 
     return result;
 }
 
 } // namespace blink