Have HTMLCollection::item() return an Element as per specification

Source/core/html/HTMLSelectElement.cpp

Index: Source/core/html/HTMLSelectElement.cpp
diff --git a/Source/core/html/HTMLSelectElement.cpp b/Source/core/html/HTMLSelectElement.cpp
index a3ed48f60f99b41981b5b6ac09372713a98c1584..e933a029874a5ef16f2ee06c7061e3ae6bb76200 100644
--- a/Source/core/html/HTMLSelectElement.cpp
+++ b/Source/core/html/HTMLSelectElement.cpp
@@ -386,12 +386,12 @@ void HTMLSelectElement::setSize(int size)
     setIntegralAttribute(sizeAttr, size);
 }
 
-Node* HTMLSelectElement::namedItem(const AtomicString& name)
+Element* HTMLSelectElement::namedItem(const AtomicString& name)
 {
     return options()->namedItem(name);
 }
 
-Node* HTMLSelectElement::item(unsigned index)
+Element* HTMLSelectElement::item(unsigned index)
 {
     return options()->item(index);
 }