Make HTMLAllCollection named property getter behave more according to spec

Source/core/html/HTMLAllCollection.idl

Index: Source/core/html/HTMLAllCollection.idl
diff --git a/Source/core/html/HTMLAllCollection.idl b/Source/core/html/HTMLAllCollection.idl
index f7103af16fc429173c6b2bedcaa0af7e7c0e6fb5..5ca9c6b3c3b09357e9047816381e4d8ee24c8295 100644
--- a/Source/core/html/HTMLAllCollection.idl
+++ b/Source/core/html/HTMLAllCollection.idl
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
+ * Copyright (C) 2014 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -23,6 +24,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+// FIXME: This interface should inherit HTMLCollection.
 [
     Custom=LegacyCallAsFunction,
     DependentLifetime,
@@ -31,6 +33,6 @@
     readonly attribute unsigned long length;
     [ImplementedAs=item] getter Element (unsigned long index);
     [Custom] Element item([Default=Undefined] optional unsigned long index);
-    [NotEnumerable] getter (NodeList or Element) (DOMString name);
-    [Custom] Element namedItem(DOMString name);
+    // FIXME: This should return an (HTMLCollection or Element) union.
+    [ImplementedAs=namedGetter] getter (NodeList or Element) namedItem(DOMString name);
 };