Make it clear a DocumentNameCollection can only contain HTMLElements

Source/core/html/HTMLCollection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003-2008, 2011, 2012, 2014 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 192 matching lines @@
 
 static inline bool isMatchingHTMLElement(const HTMLCollection& htmlCollection, const HTMLElement& element)
 {
     switch (htmlCollection.type()) {
     case DocImages:
         return element.hasTagName(imgTag);
     case DocScripts:
         return element.hasTagName(scriptTag);
     case DocForms:
         return element.hasTagName(formTag);
+    case DocumentNamedItems:
+        return toDocumentNameCollection(htmlCollection).elementMatches(element);
     case TableTBodies:
         return element.hasTagName(tbodyTag);
     case TRCells:
         return element.hasTagName(tdTag) || element.hasTagName(thTag);
     case TSectionRows:
         return element.hasTagName(trTag);
     case SelectOptions:
         return element.hasTagName(optionTag);
     case SelectedOptions:
         return isHTMLOptionElement(element) && toHTMLOptionElement(element).selected();
@@ skipping 13 matching lines @@
     case DocLinks:
         return (element.hasTagName(aTag) || element.hasTagName(areaTag)) && element.fastHasAttribute(hrefAttr);
     case DocAnchors:
         return element.hasTagName(aTag) && element.fastHasAttribute(nameAttr);
     case ClassCollectionType:
     case TagCollectionType:
     case HTMLTagCollectionType:
     case DocAll:
     case NodeChildren:
     case FormControls:
-    case DocumentNamedItems:
     case TableRows:
     case WindowNamedItems:
     case NameNodeListType:
     case RadioNodeListType:
     case RadioImgNodeListType:
     case LabelsNodeListType:
         ASSERT_NOT_REACHED();
     }
     return false;
 }
 
 inline bool HTMLCollection::elementMatches(const Element& element) const
 {
     // These collections apply to any kind of Elements, not just HTMLElements.
     switch (type()) {
     case DocAll:
     case NodeChildren:
         return true;
     case ClassCollectionType:
         return toClassCollection(*this).elementMatches(element);
     case TagCollectionType:
         return toTagCollection(*this).elementMatches(element);
     case HTMLTagCollectionType:
         return toHTMLTagCollection(*this).elementMatches(element);
-    case DocumentNamedItems:
-        return toDocumentNameCollection(*this).elementMatches(element);
     case WindowNamedItems:
         return toWindowNameCollection(*this).elementMatches(element);
     default:
         break;
     }
 
     // The following only applies to HTMLElements.
     return element.isHTMLElement() && isMatchingHTMLElement(*this, toHTMLElement(element));
 }
 
@@ skipping 220 matching lines @@
 }
 
 void HTMLCollection::trace(Visitor* visitor)
 {
     visitor->trace(m_namedItemCache);
     visitor->trace(m_collectionIndexCache);
     LiveNodeListBase::trace(visitor);
 }
 
 } // namespace blink