Remove unused PS generation code.

core/fxcodec/codec/ccodec_basicmodule.h

 // Copyright 2016 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_CCODEC_BASICMODULE_H_
 #define CORE_FXCODEC_CODEC_CCODEC_BASICMODULE_H_
 
 #include "core/fxcrt/include/fx_system.h"
 
 class CCodec_ScanlineDecoder;
 
 class CCodec_BasicModule {
  public:
-  FX_BOOL RunLengthEncode(const uint8_t* src_buf,
-                          uint32_t src_size,
-                          uint8_t*& dest_buf,
-                          uint32_t& dest_size);
-  FX_BOOL A85Encode(const uint8_t* src_buf,
-                    uint32_t src_size,
-                    uint8_t*& dest_buf,
-                    uint32_t& dest_size);
   CCodec_ScanlineDecoder* CreateRunLengthDecoder(const uint8_t* src_buf,
                                                  uint32_t src_size,
                                                  int width,
                                                  int height,
                                                  int nComps,
                                                  int bpc);
 };
 
 #endif  // CORE_FXCODEC_CODEC_CCODEC_BASICMODULE_H_