Fix virtual/override/final usage in Source/platform/.

Source/platform/graphics/GraphicsLayerDebugInfo.h

 /*
  * Copyright (C) 2014 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 @@
 #include "platform/graphics/PaintInvalidationReason.h"
 #include "public/platform/WebGraphicsLayerDebugInfo.h"
 
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class GraphicsLayerDebugInfo final : public WebGraphicsLayerDebugInfo {
 public:
     GraphicsLayerDebugInfo();
-    virtual ~GraphicsLayerDebugInfo();
+    ~GraphicsLayerDebugInfo() override;
 
-    virtual void appendAsTraceFormat(WebString* out) const override;
+    void appendAsTraceFormat(WebString* out) const override;
 
     GraphicsLayerDebugInfo* clone() const;
 
     void setDebugName(const String& name) { m_debugName = name; }
     CompositingReasons compositingReasons() const { return m_compositingReasons; }
     void setCompositingReasons(CompositingReasons reasons) { m_compositingReasons = reasons; }
     void setOwnerNodeId(int id) { m_ownerNodeId = id; }
 
     void appendAnnotatedInvalidateRect(const FloatRect&, PaintInvalidationReason);
     void clearAnnotatedInvalidateRects();
@@ skipping 12 matching lines @@
     String m_debugName;
     CompositingReasons m_compositingReasons;
     int m_ownerNodeId;
     Vector<AnnotatedInvalidationRect> m_invalidations;
     Vector<AnnotatedInvalidationRect> m_previousInvalidations;
 };
 
 } // namespace blink
 
 #endif