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

Source/core/html/HTMLQuoteElement.h

Index: Source/core/html/HTMLQuoteElement.h
diff --git a/Source/core/html/HTMLQuoteElement.h b/Source/core/html/HTMLQuoteElement.h
index d0b5da308633a45ed9bcecd0d0939fa444ae61bb..d352f14e64bb043c495d67b1c26da228deb90af2 100644
--- a/Source/core/html/HTMLQuoteElement.h
+++ b/Source/core/html/HTMLQuoteElement.h
@@ -37,9 +37,9 @@ public:
 private:
     HTMLQuoteElement(const QualifiedName&, Document&);
 
-    virtual bool isURLAttribute(const Attribute&) const override;
-    virtual bool hasLegalLinkAttribute(const QualifiedName&) const override;
-    virtual const QualifiedName& subResourceAttributeName() const override;
+    bool isURLAttribute(const Attribute&) const override;
+    bool hasLegalLinkAttribute(const QualifiedName&) const override;
+    const QualifiedName& subResourceAttributeName() const override;
 };
 
 inline bool isHTMLQuoteElement(const HTMLElement& element)