Update CSS classes to use OVERRIDE / FINAL when needed

Source/core/css/CSSStyleRule.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2008, 2012 Apple Inc. 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 12 matching lines @@
 #define CSSStyleRule_h
 
 #include "core/css/CSSRule.h"
 
 namespace WebCore {
 
 class CSSStyleDeclaration;
 class StyleRuleCSSStyleDeclaration;
 class StyleRule;
 
-class CSSStyleRule : public CSSRule {
+class CSSStyleRule FINAL : public CSSRule {
 public:
     static PassRefPtr<CSSStyleRule> create(StyleRule* rule, CSSStyleSheet* sheet) { return adoptRef(new CSSStyleRule(rule, sheet)); }
 
     virtual ~CSSStyleRule();
 
-    virtual CSSRule::Type type() const { return STYLE_RULE; }
+    virtual CSSRule::Type type() const OVERRIDE { return STYLE_RULE; }
     virtual String cssText() const OVERRIDE;
     virtual void reattach(StyleRuleBase*) OVERRIDE;
 
     String selectorText() const;
     void setSelectorText(const String&);
 
     CSSStyleDeclaration* style() const;
 
     // FIXME: Not CSSOM. Remove.
     StyleRule* styleRule() const { return m_styleRule.get(); }
 
 private:
     CSSStyleRule(StyleRule*, CSSStyleSheet*);
 
     String generateSelectorText() const;
 
     RefPtr<StyleRule> m_styleRule;
     mutable RefPtr<StyleRuleCSSStyleDeclaration> m_propertiesCSSOMWrapper;
 };
 
 DEFINE_CSS_RULE_TYPE_CASTS(CSSStyleRule, STYLE_RULE);
 
 } // namespace WebCore
 
 #endif // CSSStyleRule_h