Have HTMLConstructionSite::createHTMLElement() return an HTMLElement

Source/core/html/parser/HTMLConstructionSite.h

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  * Copyright (C) 2011 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
@@ skipping 207 matching lines @@
     // tokens produce only one DOM mutation.
     typedef WillBeHeapVector<HTMLConstructionSiteTask, 1> TaskQueue;
 
     void setCompatibilityMode(Document::CompatibilityMode);
     void setCompatibilityModeFromDoctype(const String& name, const String& publicId, const String& systemId);
 
     void attachLater(ContainerNode* parent, PassRefPtrWillBeRawPtr<Node> child, bool selfClosing = false);
 
     void findFosterSite(HTMLConstructionSiteTask&);
 
-    PassRefPtrWillBeRawPtr<Element> createHTMLElement(AtomicHTMLToken*);
+    PassRefPtrWillBeRawPtr<HTMLElement> createHTMLElement(AtomicHTMLToken*);
     PassRefPtrWillBeRawPtr<Element> createElement(AtomicHTMLToken*, const AtomicString& namespaceURI);
 
     void mergeAttributesFromTokenIntoElement(AtomicHTMLToken*, Element*);
     void dispatchDocumentElementAvailableIfNeeded();
 
     void executeTask(HTMLConstructionSiteTask&);
     void queueTask(const HTMLConstructionSiteTask&);
 
     RawPtrWillBeMember<Document> m_document;
 
@@ skipping 68 matching lines @@
     // "whenever a node would be inserted into the current node, it must instead
     // be foster parented."  This flag tracks whether we're in that state.
     bool m_redirectAttachToFosterParent;
 
     bool m_inQuirksMode;
 };
 
 } // namespace blink
 
 #endif