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

Source/core/html/shadow/DetailsMarkerControl.h

 /*
  * Copyright (C) 2011 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 26 matching lines @@
 namespace blink {
 
 class HTMLSummaryElement;
 
 class DetailsMarkerControl final : public HTMLDivElement {
 public:
     explicit DetailsMarkerControl(Document&);
     static PassRefPtrWillBeRawPtr<DetailsMarkerControl> create(Document&);
 
 private:
-    virtual LayoutObject* createLayoutObject(const ComputedStyle&) override;
-    virtual bool layoutObjectIsNeeded(const ComputedStyle&) override;
+    LayoutObject* createLayoutObject(const ComputedStyle&) override;
+    bool layoutObjectIsNeeded(const ComputedStyle&) override;
 
     HTMLSummaryElement* summaryElement();
 };
 
 inline PassRefPtrWillBeRawPtr<DetailsMarkerControl> DetailsMarkerControl::create(Document& document)
 {
     RefPtrWillBeRawPtr<DetailsMarkerControl> element = adoptRefWillBeNoop(new DetailsMarkerControl(document));
     element->setShadowPseudoId(AtomicString("-webkit-details-marker", AtomicString::ConstructFromLiteral));
     return element.release();
 }
 
 }
 
 #endif