Correctly handle accessing a replaced Attr object's attribute value.

Source/core/dom/ElementData.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 132 matching lines @@
 class UniqueElementData FINAL : public ElementData {
 public:
     static PassRefPtr<UniqueElementData> create();
     PassRefPtr<ShareableElementData> makeShareableCopy() const;
 
     // These functions do no error/duplicate checking.
     void addAttribute(const QualifiedName&, const AtomicString&);
     void removeAttribute(size_t index);
 
     Attribute& attributeItem(unsigned index);
-    Attribute* getAttributeItem(const QualifiedName&);
+    Attribute* getAttributeItem(const QualifiedName&, bool shouldIgnoreCase);
 
     UniqueElementData();
     explicit UniqueElementData(const ShareableElementData&);
     explicit UniqueElementData(const UniqueElementData&);
 
     // FIXME: We might want to support sharing element data for elements with
     // presentation attribute style. Lots of table cells likely have the same
     // attributes. Most modern pages don't use presentation attributes though
     // so this might not make sense.
     mutable RefPtr<StylePropertySet> m_presentationAttributeStyle;
@@ skipping 106 matching lines @@
 }
 
 inline Attribute& UniqueElementData::attributeItem(unsigned index)
 {
     return m_attributeVector.at(index);
 }
 
 } // namespace WebCore
 
 #endif // ElementData_h