Simplify the HTMLCollection destructor

Source/core/html/HTMLCollection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2011, 2012 Apple Inc. All rights reserved.
  * 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 157 matching lines @@
 
 PassRefPtr<HTMLCollection> HTMLCollection::create(ContainerNode& base, CollectionType type)
 {
     return adoptRef(new HTMLCollection(base, type, DoesNotOverrideItemAfter));
 }
 
 HTMLCollection::~HTMLCollection()
 {
     if (hasValidIdNameCache())
         unregisterIdNameCacheFromDocument(document());
-    // HTMLNameCollection, ClassCollection and TagCollection remove cache by themselves.
-    if (type() != WindowNamedItems && type() != DocumentNamedItems && type() != ClassCollectionType
-        && type() != HTMLTagCollectionType && type() != TagCollectionType) {
+    // Named HTMLCollection types remove cache by themselves.
+    if (isUnnamedHTMLCollectionType(type()))
         ownerNode().nodeLists()->removeCache(this, type());
-    }
 }
 
 void HTMLCollection::invalidateCache(Document* oldDocument) const
 {
     m_collectionIndexCache.invalidate();
     invalidateIdNameCacheMaps(oldDocument);
 }
 
 template <class NodeListType>
 inline bool isMatchingElement(const NodeListType&, const Element&);
@@ skipping 316 matching lines @@
 
     for (unsigned i = 0; nameResults && i < nameResults->size(); ++i)
         result.append(nameResults->at(i));
 }
 
 HTMLCollection::NamedItemCache::NamedItemCache()
 {
 }
 
 } // namespace WebCore