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

public/web/WebNodeCollection.h

 /*
  * Copyright (C) 2009 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 21 matching lines @@
 #define WebNodeCollection_h
 
 #include "../platform/WebCommon.h"
 
 namespace WebCore { class HTMLCollection; }
 #if BLINK_IMPLEMENTATION
 namespace WTF { template <typename T> class PassRefPtr; }
 #endif
 
 namespace blink {
-class WebNode;
+class WebElement;
 
 // Provides readonly access to some properties of a DOM node.
 class WebNodeCollection {
 public:
     ~WebNodeCollection() { reset(); }
 
     WebNodeCollection() : m_private(0), m_current(0) { }
     WebNodeCollection(const WebNodeCollection& n) : m_private(0) { assign(n); }
     WebNodeCollection& operator=(const WebNodeCollection& n)
     {
         assign(n);
         return *this;
     }
 
     bool isNull() const { return !m_private; }
 
     BLINK_EXPORT void reset();
     BLINK_EXPORT void assign(const WebNodeCollection&);
 
     BLINK_EXPORT unsigned length() const;
-    BLINK_EXPORT WebNode nextItem() const;
-    BLINK_EXPORT WebNode firstItem() const;
+    BLINK_EXPORT WebElement nextItem() const;
+    BLINK_EXPORT WebElement firstItem() const;
 
 #if BLINK_IMPLEMENTATION
     WebNodeCollection(const WTF::PassRefPtr<WebCore::HTMLCollection>&);
 #endif
 
 private:
     void assign(WebCore::HTMLCollection*);
     WebCore::HTMLCollection* m_private;
     mutable unsigned m_current;
 
     friend class WebNodeList;
 };
 
 } // namespace blink
 
 #endif