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

Source/core/layout/LayoutIFrame.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 16 matching lines @@
 #define LayoutIFrame_h
 
 #include "core/layout/LayoutPart.h"
 
 namespace blink {
 
 class LayoutIFrame final : public LayoutPart {
 public:
     explicit LayoutIFrame(Element*);
 
-    virtual const char* name() const override { return "LayoutIFrame"; }
+    const char* name() const override { return "LayoutIFrame"; }
 
 private:
-    virtual bool shouldComputeSizeAsReplaced() const override;
-    virtual bool isInlineBlockOrInlineTable() const override;
+    bool shouldComputeSizeAsReplaced() const override;
+    bool isInlineBlockOrInlineTable() const override;
 
-    virtual void layout() override;
+    void layout() override;
 
-    virtual bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectLayoutIFrame || LayoutPart::isOfType(type); }
+    bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectLayoutIFrame || LayoutPart::isOfType(type); }
 
-    virtual DeprecatedPaintLayerType layerTypeRequired() const override;
+    DeprecatedPaintLayerType layerTypeRequired() const override;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutIFrame, isLayoutIFrame());
 
 } // namespace blink
 
 #endif // LayoutIFrame_h