Cleanup: Remove unused CFX_PSRenderer and various encoders it used.

core/include/fpdfapi/fpdf_parser.h

Index: core/include/fpdfapi/fpdf_parser.h
diff --git a/core/include/fpdfapi/fpdf_parser.h b/core/include/fpdfapi/fpdf_parser.h
index 752df789daddc0b1d4ea7e84ea0146ba4edef084..1e2706ddcfbc09dbbf9e87d961aaf4804487cd28 100644
--- a/core/include/fpdfapi/fpdf_parser.h
+++ b/core/include/fpdfapi/fpdf_parser.h
@@ -826,18 +826,19 @@ CFX_WideString FPDF_FileSpec_GetWin32Path(const CPDF_Object* pFileSpec);
 void FPDF_FileSpec_SetWin32Path(CPDF_Object* pFileSpec,
                                 const CFX_WideString& fullpath);
 
-void FlateEncode(const uint8_t* src_buf,
+bool FlateEncode(const uint8_t* src_buf,
                  FX_DWORD src_size,
-                 uint8_t*& dest_buf,
-                 FX_DWORD& dest_size);
-void FlateEncode(const uint8_t* src_buf,
-                 FX_DWORD src_size,
-                 int predictor,
-                 int Colors,
-                 int BitsPerComponent,
-                 int Columns,
-                 uint8_t*& dest_buf,
-                 FX_DWORD& dest_size);
+                 uint8_t** dest_buf,
+                 FX_DWORD* dest_size);
+
+// This used to have more parameters like the predictor and bpc, but there was
+// only one callers, so the interface has been simplified, the values are hard
+// coded, and dead code has been removed.
+bool PngEncode(const uint8_t* src_buf,
+               FX_DWORD src_size,
+               uint8_t** dest_buf,
+               FX_DWORD* dest_size);
+
 FX_DWORD FlateDecode(const uint8_t* src_buf,
                      FX_DWORD src_size,
                      uint8_t*& dest_buf,