Remove openjpeg write support.

core/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_FXCODEC_CODEC_CODEC_INT_H_
 #define CORE_FXCODEC_CODEC_CODEC_INT_H_
 
 #include <limits.h>
 
 #include <list>
 #include <map>
 #include <memory>
 #include <vector>
 
 #include "core/fxcodec/fx_codec.h"
 #include "core/fxcodec/jbig2/JBig2_Context.h"
 #include "third_party/libopenjpeg20/openjpeg.h"
 
 class CPDF_ColorSpace;
 
 struct DecodeData {
- public:
-  DecodeData(uint8_t* data, OPJ_SIZE_T size)
+  DecodeData(const uint8_t* data, OPJ_SIZE_T size)
       : src_data(data), src_size(size), offset(0) {}
-  uint8_t* src_data;
+
+  const uint8_t* src_data;
   OPJ_SIZE_T src_size;
   OPJ_SIZE_T offset;
 };
 
 void sycc420_to_rgb(opj_image_t* img);
 
 /* Wrappers for C-style callbacks. */
 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_FXCODEC_CODEC_CODEC_INT_H_