Update HTMLCollection's named property getter to behave according to spec

Source/core/html/HTMLCollection.idl

Index: Source/core/html/HTMLCollection.idl
diff --git a/Source/core/html/HTMLCollection.idl b/Source/core/html/HTMLCollection.idl
index fb9b844d1332cf0118494d229bcd3fca86106a11..337cfea07b346d8d8921d366bf5fcd3bcdeeebfb 100644
--- a/Source/core/html/HTMLCollection.idl
+++ b/Source/core/html/HTMLCollection.idl
@@ -1,6 +1,7 @@
 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
+ * Copyright (C) 2014 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ -25,7 +26,6 @@
 ] interface HTMLCollection {
     readonly attribute unsigned long length;
     getter Element item([Default=Undefined] optional unsigned long index);
-    Element namedItem([Default=Undefined] optional DOMString name);
-    [NotEnumerable, ImplementedAs=namedItem] getter Element ([Default=Undefined] optional DOMString name);
+    getter Element namedItem(DOMString name);
 };