Update remaining core classes to use OVERRIDE / FINAL when needed

Source/core/timing/PerformanceNavigation.h

 /*
  * Copyright (C) 2010 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 22 matching lines @@
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/frame/DOMWindowProperty.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
 class Frame;
 
-class PerformanceNavigation : public RefCounted<PerformanceNavigation>, public ScriptWrappable, public DOMWindowProperty {
+class PerformanceNavigation FINAL : public RefCounted<PerformanceNavigation>, public ScriptWrappable, public DOMWindowProperty {
 public:
     static PassRefPtr<PerformanceNavigation> create(Frame* frame) { return adoptRef(new PerformanceNavigation(frame)); }
 
     enum PerformanceNavigationType {
         TYPE_NAVIGATE,
         TYPE_RELOAD,
         TYPE_BACK_FORWARD,
         TYPE_RESERVED = 255
     };
 
     unsigned short type() const;
     unsigned short redirectCount() const;
 
 private:
     explicit PerformanceNavigation(Frame*);
 };
 
 }
 
 #endif // !defined(PerformanceNavigation_h)