Clean compiling warnings on Linux

xfa/src/fxbarcode/BC_Writer.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 XFA_SRC_FXBARCODE_BC_WRITER_H_
 #define XFA_SRC_FXBARCODE_BC_WRITER_H_
 
 #include "core/include/fxcrt/fx_string.h"
 #include "core/include/fxge/fx_dib.h"
 #include "xfa/src/fxbarcode/utils.h"
 
 class CBC_Writer {
  public:
   CBC_Writer();
   virtual ~CBC_Writer();
-  virtual uint8_t* Encode(const CFX_ByteString& contents,
-                          BCFORMAT format,
-                          int32_t& outWidth,
-                          int32_t& outHeight,
-                          int32_t& e) = 0;
-  virtual uint8_t* Encode(const CFX_ByteString& contents,
-                          BCFORMAT format,
-                          int32_t& outWidth,
-                          int32_t& outHeight,
-                          int32_t hints,
-                          int32_t& e) = 0;
   virtual FX_BOOL SetCharEncoding(int32_t encoding);
   virtual FX_BOOL SetModuleHeight(int32_t moduleHeight);
   virtual FX_BOOL SetModuleWidth(int32_t moduleWidth);
   virtual FX_BOOL SetHeight(int32_t height);
   virtual FX_BOOL SetWidth(int32_t width);
   virtual void SetBackgroundColor(FX_ARGB backgroundColor);
   virtual void SetBarcodeColor(FX_ARGB foregroundColor);
 
  protected:
   CFX_DIBitmap* CreateDIBitmap(int32_t width, int32_t height);
   int32_t m_CharEncoding;
   int32_t m_ModuleHeight;
   int32_t m_ModuleWidth;
   int32_t m_Height;
   int32_t m_Width;
   FXDIB_Format m_colorSpace;
   FX_ARGB m_barColor;
   FX_ARGB m_backgroundColor;
 };
 
 #endif  // XFA_SRC_FXBARCODE_BC_WRITER_H_