Fix virtual/override/final usage in Source/core/{animation,css,style}/.

Source/core/css/CSSSupportsRule.h

 /* Copyright (C) 2012 Motorola Mobility 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
@@ skipping 25 matching lines @@
 class StyleRuleSupports;
 
 class CSSSupportsRule final : public CSSGroupingRule {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<CSSSupportsRule> create(StyleRuleSupports* rule, CSSStyleSheet* sheet)
     {
         return adoptRefWillBeNoop(new CSSSupportsRule(rule, sheet));
     }
 
-    virtual ~CSSSupportsRule() { }
+    ~CSSSupportsRule() override { }
 
-    virtual String cssText() const override;
+    String cssText() const override;
 
     String conditionText() const;
 
     DEFINE_INLINE_VIRTUAL_TRACE() { CSSGroupingRule::trace(visitor); }
 
 private:
     CSSSupportsRule(StyleRuleSupports*, CSSStyleSheet*);
 
-    virtual CSSRule::Type type() const override { return SUPPORTS_RULE; }
+    CSSRule::Type type() const override { return SUPPORTS_RULE; }
 };
 
 DEFINE_CSS_RULE_TYPE_CASTS(CSSSupportsRule, SUPPORTS_RULE);
 
 } // namespace blink
 
 #endif // CSSSupportsRule_h