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

Source/bindings/v8/V8WindowShell.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 426 matching lines @@
 static v8::Handle<v8::Value> getNamedProperty(HTMLDocument* htmlDocument, const AtomicString& key, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     if (!htmlDocument->hasNamedItem(key) && !htmlDocument->hasExtraNamedItem(key))
         return v8Undefined();
 
     RefPtr<HTMLCollection> items = htmlDocument->documentNamedItems(key);
     if (items->isEmpty())
         return v8Undefined();
 
     if (items->hasExactlyOneItem()) {
-        Node* node = items->item(0);
+        Element* element = items->item(0);
         Frame* frame = 0;
-        if (node->hasTagName(HTMLNames::iframeTag) && (frame = toHTMLIFrameElement(node)->contentFrame()))
+        if (element->hasTagName(HTMLNames::iframeTag) && (frame = toHTMLIFrameElement(element)->contentFrame()))
             return toV8(frame->domWindow(), creationContext, isolate);
-        return toV8(node, creationContext, isolate);
+        return toV8(element, creationContext, isolate);
     }
     return toV8(items.release(), creationContext, isolate);
 }
 
 static void getter(v8::Local<v8::String> property, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     // FIXME: Consider passing StringImpl directly.
     AtomicString name = toCoreAtomicString(property);
     HTMLDocument* htmlDocument = V8HTMLDocument::toNative(info.Holder());
     ASSERT(htmlDocument);
@@ skipping 57 matching lines @@
 {
     ASSERT(isMainThread());
     // We're initializing the context, so it is not yet in a status where we can
     // validate the context.
     if (contextBeingInitialized)
         return true;
     return !!toDOMWindow(context);
 }
 
 } // WebCore