Let NamedNodeMap take and return Attr instead of Node

Source/core/dom/NamedNodeMap.h

Index: Source/core/dom/NamedNodeMap.h
diff --git a/Source/core/dom/NamedNodeMap.h b/Source/core/dom/NamedNodeMap.h
index f4d544289dc5622aa6cfe1eb2d0f4dcf92f100aa..4f1562553226765728f61fc9d355551bc71df419 100644
--- a/Source/core/dom/NamedNodeMap.h
+++ b/Source/core/dom/NamedNodeMap.h
@@ -33,7 +33,7 @@
 
 namespace blink {
 
-class Node;
+class Attr;
 class ExceptionState;
 
 class NamedNodeMap final : public NoBaseWillBeGarbageCollected<NamedNodeMap>, public ScriptWrappable {
@@ -53,16 +53,16 @@ public:
 
     // Public DOM interface.
 
-    PassRefPtrWillBeRawPtr<Node> getNamedItem(const AtomicString&) const;
-    PassRefPtrWillBeRawPtr<Node> removeNamedItem(const AtomicString& name, ExceptionState&);
+    PassRefPtrWillBeRawPtr<Attr> getNamedItem(const AtomicString&) const;
+    PassRefPtrWillBeRawPtr<Attr> removeNamedItem(const AtomicString& name, ExceptionState&);
 
-    PassRefPtrWillBeRawPtr<Node> getNamedItemNS(const AtomicString& namespaceURI, const AtomicString& localName) const;
-    PassRefPtrWillBeRawPtr<Node> removeNamedItemNS(const AtomicString& namespaceURI, const AtomicString& localName, ExceptionState&);
+    PassRefPtrWillBeRawPtr<Attr> getNamedItemNS(const AtomicString& namespaceURI, const AtomicString& localName) const;
+    PassRefPtrWillBeRawPtr<Attr> removeNamedItemNS(const AtomicString& namespaceURI, const AtomicString& localName, ExceptionState&);
 
-    PassRefPtrWillBeRawPtr<Node> setNamedItem(Node*, ExceptionState&);
-    PassRefPtrWillBeRawPtr<Node> setNamedItemNS(Node*, ExceptionState&);
+    PassRefPtrWillBeRawPtr<Attr> setNamedItem(Attr*, ExceptionState&);
+    PassRefPtrWillBeRawPtr<Attr> setNamedItemNS(Attr*, ExceptionState&);
 
-    PassRefPtrWillBeRawPtr<Node> item(unsigned index) const;
+    PassRefPtrWillBeRawPtr<Attr> item(unsigned index) const;
     size_t length() const;
 
     Element* element() const { return m_element; }