Remove some dead code from CCodec_Jbig2Module. Variable was only ever set to false.

core/src/fxcodec/codec/codec_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_SRC_FXCODEC_CODEC_CODEC_INT_H_
 #define CORE_SRC_FXCODEC_CODEC_CODEC_INT_H_
 
 #include <limits.h>
@@ skipping 262 matching lines @@
   ~CCodec_Jbig2Context() {}
 
   FX_DWORD m_width;
   FX_DWORD m_height;
   uint8_t* m_src_buf;
   FX_DWORD m_src_size;
   const uint8_t* m_global_data;
   FX_DWORD m_global_size;
   uint8_t* m_dest_buf;
   FX_DWORD m_dest_pitch;
-  FX_BOOL m_bFileReader;
   IFX_Pause* m_pPause;
   CJBig2_Context* m_pContext;
   CJBig2_Image* m_dest_image;
 };
 class CCodec_Jbig2Module : public ICodec_Jbig2Module {
  public:
   CCodec_Jbig2Module() {}
   ~CCodec_Jbig2Module() override;
 
   // ICodec_Jbig2Module
@@ skipping 29 matching lines @@
 OPJ_SIZE_T opj_read_from_memory(void* p_buffer,
                                 OPJ_SIZE_T nb_bytes,
                                 void* p_user_data);
 OPJ_SIZE_T opj_write_from_memory(void* p_buffer,
                                  OPJ_SIZE_T nb_bytes,
                                  void* p_user_data);
 OPJ_OFF_T opj_skip_from_memory(OPJ_OFF_T nb_bytes, void* p_user_data);
 OPJ_BOOL opj_seek_from_memory(OPJ_OFF_T nb_bytes, void* p_user_data);
 
 #endif  // CORE_SRC_FXCODEC_CODEC_CODEC_INT_H_