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

Source/core/html/HTMLDetailsElement.h

Index: Source/core/html/HTMLDetailsElement.h
diff --git a/Source/core/html/HTMLDetailsElement.h b/Source/core/html/HTMLDetailsElement.h
index e09a28aea4a3f639040c669c917597e26f2557eb..ab52fba025cd28fac4ea500b5f806cd6252c3cdc 100644
--- a/Source/core/html/HTMLDetailsElement.h
+++ b/Source/core/html/HTMLDetailsElement.h
@@ -33,7 +33,7 @@ class HTMLDetailsElement final : public HTMLElement {
 public:
     static PassRefPtrWillBeRawPtr<HTMLDetailsElement> create(Document&);
     void toggleOpen();
-    virtual ~HTMLDetailsElement();
+    ~HTMLDetailsElement() override;
 
     void dispatchPendingEvent(DetailsEventSender*);
 
@@ -42,10 +42,10 @@ public:
 private:
     explicit HTMLDetailsElement(Document&);
 
-    virtual LayoutObject* createLayoutObject(const ComputedStyle&) override;
-    virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
-    virtual void didAddUserAgentShadowRoot(ShadowRoot&) override;
-    virtual bool isInteractiveContent() const override;
+    LayoutObject* createLayoutObject(const ComputedStyle&) override;
+    void parseAttribute(const QualifiedName&, const AtomicString&) override;
+    void didAddUserAgentShadowRoot(ShadowRoot&) override;
+    bool isInteractiveContent() const override;
 
     bool m_isOpen;
 };