Fix virtual/override/final usage in Source/core/dom/.

Source/core/dom/DOMSettableTokenList.h

 /*
  * Copyright (C) 2010 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 37 matching lines @@
     , public RefCounted<DOMSettableTokenList>
 #endif
     {
     DEFINE_WRAPPERTYPEINFO();
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(DOMSettableTokenList);
 public:
     static PassRefPtrWillBeRawPtr<DOMSettableTokenList> create(DOMSettableTokenListObserver* observer = nullptr)
     {
         return adoptRefWillBeNoop(new DOMSettableTokenList(observer));
     }
-    virtual ~DOMSettableTokenList();
+    ~DOMSettableTokenList() override;
 
 #if !ENABLE(OILPAN)
-    virtual void ref() override { RefCounted<DOMSettableTokenList>::ref(); }
-    virtual void deref() override { RefCounted<DOMSettableTokenList>::deref(); }
+    void ref() override { RefCounted<DOMSettableTokenList>::ref(); }
+    void deref() override { RefCounted<DOMSettableTokenList>::deref(); }
 #endif
 
-    virtual unsigned length() const override { return m_tokens.size(); }
-    virtual const AtomicString item(unsigned index) const override;
+    unsigned length() const override { return m_tokens.size(); }
+    const AtomicString item(unsigned index) const override;
 
-    virtual void add(const Vector<String>&, ExceptionState&) override;
-    virtual void remove(const Vector<String>&, ExceptionState&) override;
+    void add(const Vector<String>&, ExceptionState&) override;
+    void remove(const Vector<String>&, ExceptionState&) override;
 
-    virtual const AtomicString& value() const override { return m_value; }
-    virtual void setValue(const AtomicString&) override;
+    const AtomicString& value() const override { return m_value; }
+    void setValue(const AtomicString&) override;
 
     const SpaceSplitString& tokens() const { return m_tokens; }
     void setObserver(DOMSettableTokenListObserver* observer) { m_observer = observer; };
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     explicit DOMSettableTokenList(DOMSettableTokenListObserver*);
 
 private:
-    virtual void addInternal(const AtomicString&) override;
-    virtual bool containsInternal(const AtomicString&) const override;
-    virtual void removeInternal(const AtomicString&) override;
+    void addInternal(const AtomicString&) override;
+    bool containsInternal(const AtomicString&) const override;
+    void removeInternal(const AtomicString&) override;
 
     AtomicString m_value;
     SpaceSplitString m_tokens;
     RawPtrWillBeWeakMember<DOMSettableTokenListObserver> m_observer;
 };
 
 } // namespace blink
 
 #endif // DOMSettableTokenList_h