Update HTML classes to use OVERRIDE / FINAL when needed

Source/core/html/HTMLImportChild.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 33 matching lines @@
 
 //
 // An import tree node subclas to encapsulate imported document
 // lifecycle. This class is owned by LinkStyle. The actual loading
 // is done by HTMLImportLoader, which can be shared among multiple
 // HTMLImportChild of same link URL.
 //
 // HTMLImportChild implements ResourceClient through HTMLImportResourceOwner
 // so that it can speculatively request linked resources while it is unblocked.
 //
-class HTMLImportChild : public HTMLImport, public HTMLImportLoaderClient, public HTMLImportResourceOwner {
+class HTMLImportChild FINAL : public HTMLImport, public HTMLImportLoaderClient, public HTMLImportResourceOwner {
 public:
     HTMLImportChild(const KURL&, bool createdByParser);
     virtual ~HTMLImportChild();
 
     Document* importedDocument() const;
     const KURL& url() const { return m_url; }
 
     void wasAlreadyLoadedAs(HTMLImportChild* found);
     void startLoading(const ResourcePtr<RawResource>&);
     void importDestroyed();
@@ skipping 26 matching lines @@
 
     KURL m_url;
     RefPtr<HTMLImportLoader> m_loader;
     Vector<HTMLImportChildClient*> m_clients;
     bool m_traversingClients;
 };
 
 } // namespace WebCore
 
 #endif // HTMLImportChild_h