Make code compile with clang_use_chrome_plugin (final)

xfa/fde/fde_object.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef XFA_FDE_FDE_OBJECT_H_
 #define XFA_FDE_FDE_OBJECT_H_
 
 #include <cstdint>
 
 #include "core/fxge/include/fx_dib.h"
 #include "xfa/fgas/crt/fgas_memory.h"
 
 class CFDE_Brush : public CFX_Target {
  public:
   CFDE_Brush() : m_Color(0xFF000000) {}
 
   FX_ARGB GetColor() const { return m_Color; }
   void SetColor(FX_ARGB color) { m_Color = color; }
 
  private:
   FX_ARGB m_Color;
 };
 
 class CFDE_Pen : public CFX_Target {
  public:
   CFDE_Pen() : m_Color(0) {}
-  ~CFDE_Pen() {}
+  ~CFDE_Pen() override {}
 
   FX_ARGB GetColor() const { return m_Color; }
   void SetColor(FX_ARGB color) { m_Color = color; }
 
  private:
   FX_ARGB m_Color;
 };
 
 #endif  // XFA_FDE_FDE_OBJECT_H_