Cleanup various IFX_ text interfaces.

core/fxcrt/include/fx_arb.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 CORE_FXCRT_INCLUDE_FX_ARB_H_
 #define CORE_FXCRT_INCLUDE_FX_ARB_H_
 
 #include "core/fxcrt/include/fx_system.h"
 #include "core/fxcrt/include/fx_ucd.h"
 
-class IFX_ArabicChar;
-
 struct FX_ARBFORMTABLE {
   uint16_t wIsolated;
   uint16_t wFinal;
   uint16_t wInitial;
   uint16_t wMedial;
 };
 
 struct FX_ARAALEF {
   uint16_t wAlef;
   uint16_t wIsolated;
 };
 
 struct FX_ARASHADDA {
   uint16_t wShadda;
   uint16_t wIsolated;
 };
 
 const FX_ARBFORMTABLE* FX_GetArabicFormTable(FX_WCHAR unicode);
 FX_WCHAR FX_GetArabicFromAlefTable(FX_WCHAR alef);
 FX_WCHAR FX_GetArabicFromShaddaTable(FX_WCHAR shadda);
 
 enum FX_ARBPOSITION {
   FX_ARBPOSITION_Isolated = 0,
   FX_ARBPOSITION_Final,
   FX_ARBPOSITION_Initial,
   FX_ARBPOSITION_Medial,
 };
 
-class IFX_ArabicChar {
- public:
-  static IFX_ArabicChar* Create();
-  virtual ~IFX_ArabicChar() {}
-  virtual void Release() = 0;
-  virtual FX_BOOL IsArabicChar(FX_WCHAR wch) const = 0;
-  virtual FX_BOOL IsArabicFormChar(FX_WCHAR wch) const = 0;
-  virtual FX_WCHAR GetFormChar(FX_WCHAR wch,
-                               FX_WCHAR prev = 0,
-                               FX_WCHAR next = 0) const = 0;
-  virtual FX_WCHAR GetFormChar(const CFX_Char* cur,
-                               const CFX_Char* prev,
-                               const CFX_Char* next) const = 0;
-};
-
 void FX_BidiLine(CFX_WideString& wsText, int32_t iBaseLevel = 0);
 void FX_BidiLine(CFX_TxtCharArray& chars,
                  int32_t iCount,
                  int32_t iBaseLevel = 0);
 void FX_BidiLine(CFX_RTFCharArray& chars,
                  int32_t iCount,
                  int32_t iBaseLevel = 0);
 
 #endif  // CORE_FXCRT_INCLUDE_FX_ARB_H_