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

Source/core/layout/LayoutFullScreen.h

 /*
  * Copyright (C) 2010 Apple 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 17 matching lines @@
 #include "core/CoreExport.h"
 #include "core/layout/LayoutFlexibleBox.h"
 #include "core/style/StyleInheritedData.h"
 
 namespace blink {
 
 class CORE_EXPORT LayoutFullScreen final : public LayoutFlexibleBox {
 public:
     static LayoutFullScreen* createAnonymous(Document*);
 
-    virtual bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectLayoutFullScreen || LayoutFlexibleBox::isOfType(type); }
-    virtual const char* name() const override { return "LayoutFullScreen"; }
+    bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectLayoutFullScreen || LayoutFlexibleBox::isOfType(type); }
+    const char* name() const override { return "LayoutFullScreen"; }
 
     void setPlaceholder(LayoutBlock*);
     LayoutBlock* placeholder() { return m_placeholder; }
     void createPlaceholder(PassRefPtr<ComputedStyle>, const LayoutRect& frameRect);
 
 
     static LayoutObject* wrapLayoutObject(LayoutObject*, LayoutObject*, Document*);
     void unwrapLayoutObject();
 
     void updateStyle();
 
 private:
     LayoutFullScreen();
-    virtual void willBeDestroyed() override;
+    void willBeDestroyed() override;
 
 protected:
     LayoutBlock* m_placeholder;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutFullScreen, isLayoutFullScreen());
 
 }
 
 #endif