Rename ElementData's attribute related methods for clarity

Source/core/inspector/DOMPatchSupport.cpp

Index: Source/core/inspector/DOMPatchSupport.cpp
diff --git a/Source/core/inspector/DOMPatchSupport.cpp b/Source/core/inspector/DOMPatchSupport.cpp
index c2cfcec443a5b4cf039de8ea5f3349ac4472de23..e853b2fc6919aea1b499dee016d4c8eeec226cce 100644
--- a/Source/core/inspector/DOMPatchSupport.cpp
+++ b/Source/core/inspector/DOMPatchSupport.cpp
@@ -191,7 +191,7 @@ bool DOMPatchSupport::innerPatchNode(Digest* oldDigest, Digest* newDigest, Excep
         // FIXME: Create a function in Element for removing all properties. Take in account whether did/willModifyAttribute are important.
         if (oldElement->hasAttributesWithoutUpdate()) {
             while (oldElement->attributeCount()) {
-                const Attribute& attribute = oldElement->attributeItem(0);
+                const Attribute& attribute = oldElement->attributeAt(0);
                 if (!m_domEditor->removeAttribute(oldElement, attribute.localName(), exceptionState))
                     return false;
             }