Use std::vector for fx_ucd.h arrays.

core/fxcrt/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_FX_ARB_H_
 #define CORE_FXCRT_FX_ARB_H_
 
+#include <vector>
+
 #include "core/fxcrt/fx_system.h"
 #include "core/fxcrt/fx_ucd.h"
 
 struct FX_ARBFORMTABLE {
   uint16_t wIsolated;
   uint16_t wFinal;
   uint16_t wInitial;
   uint16_t wMedial;
 };
 
@@ skipping 12 matching lines @@
 FX_WCHAR FX_GetArabicFromShaddaTable(FX_WCHAR shadda);
 
 enum FX_ARBPOSITION {
   FX_ARBPOSITION_Isolated = 0,
   FX_ARBPOSITION_Final,
   FX_ARBPOSITION_Initial,
   FX_ARBPOSITION_Medial,
 };
 
 void FX_BidiLine(CFX_WideString& wsText, int32_t iBaseLevel = 0);
-void FX_BidiLine(CFX_TxtCharArray& chars,
+void FX_BidiLine(std::vector<CFX_TxtChar>& chars,
                  int32_t iCount,
                  int32_t iBaseLevel = 0);
-void FX_BidiLine(CFX_RTFCharArray& chars,
+void FX_BidiLine(std::vector<CFX_RTFChar>& chars,
                  int32_t iCount,
                  int32_t iBaseLevel = 0);
 
 #endif  // CORE_FXCRT_FX_ARB_H_