Use smart pointers for various Jbig2 decoding contexts

core/fpdfapi/fpdf_render/render_int.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 CORE_FPDFAPI_FPDF_RENDER_RENDER_INT_H_
 #define CORE_FPDFAPI_FPDF_RENDER_RENDER_INT_H_
 
 #include <map>
@@ skipping 584 matching lines @@
   FX_BOOL m_bImageMask;
   FX_BOOL m_bDoBpcCheck;
   FX_BOOL m_bColorKey;
   FX_BOOL m_bHasMask;
   FX_BOOL m_bStdCS;
   DIB_COMP_DATA* m_pCompData;
   uint8_t* m_pLineBuf;
   uint8_t* m_pMaskedLine;
   std::unique_ptr<CFX_DIBitmap> m_pCachedBitmap;
   std::unique_ptr<CCodec_ScanlineDecoder> m_pDecoder;
-  CCodec_Jbig2Context* m_pJbig2Context;
   CPDF_DIBSource* m_pMask;
   std::unique_ptr<CPDF_StreamAcc> m_pGlobalStream;
+  std::unique_ptr<CCodec_Jbig2Context> m_pJbig2Context;
   CPDF_Stream* m_pMaskStream;
   int m_Status;
 };
 
 #define FPDF_HUGE_IMAGE_SIZE 60000000
 class CPDF_DIBTransferFunc : public CFX_FilteredDIB {
  public:
   explicit CPDF_DIBTransferFunc(const CPDF_TransferFunc* pTransferFunc);
   ~CPDF_DIBTransferFunc() override;
 
   // CFX_FilteredDIB
   FXDIB_Format GetDestFormat() override;
   FX_ARGB* GetDestPalette() override;
   void TranslateScanline(uint8_t* dest_buf,
                          const uint8_t* src_buf) const override;
   void TranslateDownSamples(uint8_t* dest_buf,
                             const uint8_t* src_buf,
                             int pixels,
                             int Bpp) const override;
 
   const uint8_t* m_RampR;
   const uint8_t* m_RampG;
   const uint8_t* m_RampB;
 };
 
 #endif  // CORE_FPDFAPI_FPDF_RENDER_RENDER_INT_H_