no virtual destructor for point/size/rect

ui/gfx/point_f.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_POINT_F_H_
 #define UI_GFX_POINT_F_H_
 #pragma once
 
 #include <string>
 
 #include "ui/base/ui_export.h"
 #include "ui/gfx/point_base.h"
 
 #if !defined(ENABLE_DIP)
 #error "This class should be used only when DIP feature is enabled"
 #endif
 
 namespace gfx {
 class Point;
 
 // A floating version of gfx::Point.
 class UI_EXPORT PointF : public PointBase<PointF, float> {
  public:
   PointF();
   PointF(float x, float y);
   explicit PointF(Point& point);
-  virtual ~PointF() {}
+  ~PointF() {}
 
   Point ToPoint() const;
 
   // Returns a string representation of point.
   std::string ToString() const;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_POINT_F_H_