Cleanup forward declarations.

xfa/src/fxbarcode/BC_UtilRSS.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_UTILRSS_H_
 #define XFA_SRC_FXBARCODE_BC_UTILRSS_H_
 
 #include <cstdint>
 
 #include "core/include/fxcrt/fx_basic.h"
 
-class CBC_RssPair;
 class CBC_UtilRSS {
  public:
   virtual ~CBC_UtilRSS();
   static int32_t GetRSSvalue(CFX_Int32Array& widths,
                              int32_t maxWidth,
                              FX_BOOL noNarrow);
 
  protected:
   static CFX_Int32Array* GetRssWidths(int32_t val,
                                       int32_t n,
                                       int32_t elements,
                                       int32_t maxWidth,
                                       FX_BOOL noNarrow);
   static int32_t Combins(int32_t n, int32_t r);
   static CFX_Int32Array* Elements(CFX_Int32Array& eDist, int32_t N, int32_t K);
 
  private:
   CBC_UtilRSS();
 };
 
 #endif  // XFA_SRC_FXBARCODE_BC_UTILRSS_H_