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

Source/core/dom/ElementData.cpp

 /*
  * 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 197 matching lines @@
 {
     return adoptRef(new UniqueElementData);
 }
 
 PassRefPtr<ShareableElementData> UniqueElementData::makeShareableCopy() const
 {
     void* slot = WTF::fastMalloc(sizeForShareableElementDataWithAttributeCount(m_attributeVector.size()));
     return adoptRef(new (slot) ShareableElementData(*this));
 }
 
-Attribute* UniqueElementData::getAttributeItem(const QualifiedName& name)
+Attribute* UniqueElementData::getAttributeItem(const QualifiedName& name, bool shouldIgnoreCase)
 {
     unsigned length = this->length();
     for (unsigned i = 0; i < length; ++i) {
-        if (m_attributeVector.at(i).name().matches(name))
+        if (m_attributeVector.at(i).name().matchesPossiblyIgnoringCase(name, shouldIgnoreCase))
             return &m_attributeVector.at(i);
     }
     return 0;
 }
 
 } // namespace WebCore