WIP (Introduce WTF::NonNullPtr<T>.)

Source/core/accessibility/AccessibilityRenderObject.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 947 matching lines @@
         return 0;
 
     if (m_renderer->node() && !m_renderer->node()->isElementNode())
         return 0;
     Element* element = toElement(m_renderer->node());
 
     const AtomicString& activeDescendantAttrStr = element->getAttribute(aria_activedescendantAttr);
     if (activeDescendantAttrStr.isNull() || activeDescendantAttrStr.isEmpty())
         return 0;
 
-    Element* target = element->treeScope().getElementById(activeDescendantAttrStr);
+    Element* target = element->treeScope()->getElementById(activeDescendantAttrStr);
     if (!target)
         return 0;
 
     AccessibilityObject* obj = axObjectCache()->getOrCreate(target);
     if (obj && obj->isAccessibilityRenderObject())
     // an activedescendant is only useful if it has a renderer, because that's what's needed to post the notification
         return obj;
     return 0;
 }
 
@@ skipping 1396 matching lines @@
         if (label && label->renderer()) {
             LayoutRect labelRect = axObjectCache()->getOrCreate(label)->elementRect();
             result.unite(labelRect);
         }
     }
 
     return result;
 }
 
 } // namespace WebCore