Remove unused PS generation code.

core/fpdfapi/fpdf_parser/include/fpdf_parser_decode.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_FPDFAPI_FPDF_PARSER_INCLUDE_FPDF_PARSER_DECODE_H_
 #define CORE_FPDFAPI_FPDF_PARSER_INCLUDE_FPDF_PARSER_DECODE_H_
 
 #include "core/fxcrt/include/fx_basic.h"
 
 class CPDF_Dictionary;
 
 // Indexed by 8-bit char code, contains unicode code points.
 extern const uint16_t PDFDocEncoding[256];
 
 CFX_ByteString PDF_NameDecode(const CFX_ByteStringC& orig);
 CFX_ByteString PDF_NameDecode(const CFX_ByteString& orig);
 CFX_ByteString PDF_NameEncode(const CFX_ByteString& orig);
 CFX_ByteString PDF_EncodeString(const CFX_ByteString& src,
                                 FX_BOOL bHex = FALSE);
 CFX_WideString PDF_DecodeText(const uint8_t* pData, uint32_t size);
 CFX_WideString PDF_DecodeText(const CFX_ByteString& bstr);
 CFX_ByteString PDF_EncodeText(const FX_WCHAR* pString, int len = -1);
 CFX_ByteString PDF_EncodeText(const CFX_WideString& str);
 
-void FlateEncode(const uint8_t* src_buf,
+bool FlateEncode(const uint8_t* src_buf,
                  uint32_t src_size,
-                 uint8_t*& dest_buf,
-                 uint32_t& dest_size);
-void FlateEncode(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);
+                 uint8_t** dest_buf,
+                 uint32_t* dest_size);
+
+// This used to have more parameters like the predictor and bpc, but there was
+// only one caller, so the interface has been simplified, the values are hard
+// coded, and dead code has been removed.
+bool PngEncode(const uint8_t* src_buf,
+               uint32_t src_size,
+               uint8_t** dest_buf,
+               uint32_t* dest_size);
+
 uint32_t FlateDecode(const uint8_t* src_buf,
                      uint32_t src_size,
                      uint8_t*& dest_buf,
                      uint32_t& dest_size);
 uint32_t RunLengthDecode(const uint8_t* src_buf,
                          uint32_t src_size,
                          uint8_t*& dest_buf,
                          uint32_t& dest_size);
 
 // Public for testing.
@@ skipping 18 matching lines @@
                        uint32_t src_size,
                        const CPDF_Dictionary* pDict,
                        uint8_t*& dest_buf,
                        uint32_t& dest_size,
                        CFX_ByteString& ImageEncoding,
                        CPDF_Dictionary*& pImageParms,
                        uint32_t estimated_size,
                        FX_BOOL bImageAcc);
 
 #endif  // CORE_FPDFAPI_FPDF_PARSER_INCLUDE_FPDF_PARSER_DECODE_H_