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

Source/core/html/HTMLBaseElement.h

Index: Source/core/html/HTMLBaseElement.h
diff --git a/Source/core/html/HTMLBaseElement.h b/Source/core/html/HTMLBaseElement.h
index 89426522f8df3ded4ad88f8cc3f31674afa03533..4db2c734b2e6cc0990e6194786943c2b137c4690 100644
--- a/Source/core/html/HTMLBaseElement.h
+++ b/Source/core/html/HTMLBaseElement.h
@@ -38,10 +38,10 @@ public:
 private:
     explicit HTMLBaseElement(Document&);
 
-    virtual bool isURLAttribute(const Attribute&) const override;
-    virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
-    virtual InsertionNotificationRequest insertedInto(ContainerNode*) override;
-    virtual void removedFrom(ContainerNode*) override;
+    bool isURLAttribute(const Attribute&) const override;
+    void parseAttribute(const QualifiedName&, const AtomicString&) override;
+    InsertionNotificationRequest insertedInto(ContainerNode*) override;
+    void removedFrom(ContainerNode*) override;
 };
 
 } // namespace blink