Use smart pointers for class owned pointers in xfa/fxbarcode

xfa/fxbarcode/BC_TwoDimWriter.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_FXBARCODE_BC_TWODIMWRITER_H_
 #define XFA_FXBARCODE_BC_TWODIMWRITER_H_
 
+#include <memory>
+
 #include "xfa/fxbarcode/BC_Writer.h"
 
 class CBC_CommonBitMatrix;
 class CFX_RenderDevice;
 
 class CBC_TwoDimWriter : public CBC_Writer {
  public:
   CBC_TwoDimWriter();
   ~CBC_TwoDimWriter() override;
 
   virtual void RenderResult(uint8_t* code,
                             int32_t codeWidth,
                             int32_t codeHeight,
                             int32_t& e);
   virtual void RenderBitmapResult(CFX_DIBitmap*& pOutBitmap, int32_t& e);
   virtual void RenderDeviceResult(CFX_RenderDevice* device,
                                   const CFX_Matrix* matrix);
   virtual FX_BOOL SetErrorCorrectionLevel(int32_t level) = 0;
-  virtual int32_t GetErrorCorrectionLevel();
+
+  int32_t GetErrorCorrectionLevel() const;
 
  protected:
   int32_t m_iCorrectLevel;
   FX_BOOL m_bFixedSize;
-  CBC_CommonBitMatrix* m_output;
+  std::unique_ptr<CBC_CommonBitMatrix> m_output;
 };
 
 #endif  // XFA_FXBARCODE_BC_TWODIMWRITER_H_