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

Source/core/layout/svg/LayoutSVGTSpan.h

 /*
  * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
  * Copyright (C) 2006 Apple Computer Inc.
  * Copyright (C) 2009 Google Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 11 matching lines @@
 #ifndef LayoutSVGTSpan_h
 #define LayoutSVGTSpan_h
 
 #include "core/layout/svg/LayoutSVGInline.h"
 
 namespace blink {
 class LayoutSVGTSpan final : public LayoutSVGInline {
 public:
     explicit LayoutSVGTSpan(Element*);
 
-    virtual bool isChildAllowed(LayoutObject*, const ComputedStyle&) const override;
+    bool isChildAllowed(LayoutObject*, const ComputedStyle&) const override;
 
-    virtual const char* name() const override { return "LayoutSVGTSpan"; }
+    const char* name() const override { return "LayoutSVGTSpan"; }
 };
 }
 
 #endif // LayoutSVGTSpan_h