Introduce and use type casting functions for several HTMLCollection types

Source/core/html/HTMLAllCollection.cpp

 /*
  * Copyright (C) 2009, 2011, 2012 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 15 matching lines @@
 #include "config.h"
 #include "core/html/HTMLAllCollection.h"
 
 #include "core/dom/Element.h"
 #include "core/dom/NamedNodesCollection.h"
 
 namespace WebCore {
 
 PassRefPtrWillBeRawPtr<HTMLAllCollection> HTMLAllCollection::create(ContainerNode& node, CollectionType type)
 {
-    return adoptRefWillBeNoop(new HTMLAllCollection(node, type));
+    ASSERT_UNUSED(type, type == DocAll);
+    return adoptRefWillBeNoop(new HTMLAllCollection(node));
 }
 
-HTMLAllCollection::HTMLAllCollection(ContainerNode& node, CollectionType type)
-    : HTMLCollection(node, type, DoesNotOverrideItemAfter)
+HTMLAllCollection::HTMLAllCollection(ContainerNode& node)
+    : HTMLCollection(node, DocAll, DoesNotOverrideItemAfter)
 {
     ScriptWrappable::init(this);
 }
 
 HTMLAllCollection::~HTMLAllCollection()
 {
 }
 
 Element* HTMLAllCollection::namedItemWithIndex(const AtomicString& name, unsigned index) const
 {
@@ skipping 28 matching lines @@
         return;
     }
 
     // FIXME: HTML5 specification says this should be a HTMLCollection.
     // http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#htmlallcollection
     returnValue0Enabled = true;
     returnValue0 = NamedNodesCollection::create(namedItems);
 }
 
 } // namespace WebCore