Remove unused PS generation code.

core/fxcodec/codec/ccodec_flatemodule.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_FLATEMODULE_H_
 #define CORE_FXCODEC_CODEC_CCODEC_FLATEMODULE_H_
 
 #include "core/fxcrt/include/fx_system.h"
@@ skipping 16 matching lines @@
                             const uint8_t* src_buf,
                             uint32_t src_size,
                             FX_BOOL bEarlyChange,
                             int predictor,
                             int Colors,
                             int BitsPerComponent,
                             int Columns,
                             uint32_t estimated_size,
                             uint8_t*& dest_buf,
                             uint32_t& dest_size);
-  FX_BOOL Encode(const uint8_t* src_buf,
+  bool Encode(const uint8_t* src_buf,
+              uint32_t src_size,
+              uint8_t** dest_buf,
+              uint32_t* dest_size);
+  bool PngEncode(const uint8_t* src_buf,
                  uint32_t src_size,
-                 int predictor,
-                 int Colors,
-                 int BitsPerComponent,
-                 int Columns,
-                 uint8_t*& dest_buf,
-                 uint32_t& dest_size);
-  FX_BOOL Encode(const uint8_t* src_buf,
-                 uint32_t src_size,
-                 uint8_t*& dest_buf,
-                 uint32_t& dest_size);
+                 uint8_t** dest_buf,
+                 uint32_t* dest_size);
 };
 
 #endif  // CORE_FXCODEC_CODEC_CCODEC_FLATEMODULE_H_