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 74f8627def91049db2f6f5c8ff788e38b50bd5f5..ecbad32c480f4ccd84adbc7cd37bee90f3e1d173 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);
 }