Update CSS classes to use OVERRIDE / FINAL when needed

Source/core/css/FontFaceSet.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:
  *
  * 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 36 matching lines @@
 
 class CSSFontFaceSource;
 class Dictionary;
 class Document;
 class ExceptionState;
 class Font;
 class FontResource;
 class FontsReadyPromiseResolver;
 class ExecutionContext;
 
-class FontFaceSet : public RefCountedSupplement<Document, FontFaceSet>, public ActiveDOMObject, public EventTargetWithInlineData {
+class FontFaceSet FINAL : public RefCountedSupplement<Document, FontFaceSet>, public ActiveDOMObject, public EventTargetWithInlineData {
     REFCOUNTED_EVENT_TARGET(FontFaceSet);
 public:
     virtual ~FontFaceSet();
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(loading);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(loadingdone);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(loadingerror);
 
     Vector<RefPtr<FontFace> > match(const String& font, const String& text, ExceptionState&);
     bool check(const String& font, const String& text, ExceptionState&);
@@ skipping 57 matching lines @@
     FontFaceArray m_failedFonts;
 
     AsyncMethodRunner<FontFaceSet> m_asyncRunner;
 
     FontLoadHistogram m_histogram;
 };
 
 } // namespace WebCore
 
 #endif // FontFaceSet_h