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

Source/core/dom/ElementData.cpp

Index: Source/core/dom/ElementData.cpp
diff --git a/Source/core/dom/ElementData.cpp b/Source/core/dom/ElementData.cpp
index dbd47f0fdacdd821daa0551b70e00f9a4a1fa55f..10d006f75a452eb10f2cd7e5b45b3c9ec32ca344 100644
--- a/Source/core/dom/ElementData.cpp
+++ b/Source/core/dom/ElementData.cpp
@@ -215,11 +215,11 @@ PassRefPtr<ShareableElementData> UniqueElementData::makeShareableCopy() const
     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;