Use smart pointers for class owned pointers under xfa/fde

xfa/fde/fde_render.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_RENDER_H_
 #define XFA_FDE_FDE_RENDER_H_
 
 #include <memory>
+#include <vector>
 
 #include "core/fxcrt/include/fx_coordinates.h"
 #include "xfa/fde/fde_gedevice.h"
 #include "xfa/fde/fde_iterator.h"
 #include "xfa/fde/fde_visualset.h"
 
 class CFDE_RenderDevice;
 
 enum FDE_RENDERSTATUS {
   FDE_RENDERSTATUS_Reset = 0,
@@ skipping 12 matching lines @@
                       const CFX_Matrix& tmDoc2Device);
   FDE_RENDERSTATUS GetStatus() const { return m_eStatus; }
   FDE_RENDERSTATUS DoRender(IFX_Pause* pPause = nullptr);
   void StopRender();
   void RenderText(IFDE_TextSet* pTextSet, FDE_TEXTEDITPIECE* pText);
 
  protected:
   FDE_RENDERSTATUS m_eStatus;
   CFDE_RenderDevice* m_pRenderDevice;
   CFX_Matrix m_Transform;
-  FXTEXT_CHARPOS* m_pCharPos;
-  int32_t m_iCharPosCount;
+  std::vector<FXTEXT_CHARPOS> m_CharPos;
   std::unique_ptr<CFDE_Brush> m_pBrush;
   std::unique_ptr<CFDE_VisualSetIterator> m_pIterator;
 };
 
 #endif  // XFA_FDE_FDE_RENDER_H_