Make a few more const tables smaller.

core/include/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_INCLUDE_FXCRT_FX_ARB_H_
 #define CORE_INCLUDE_FXCRT_FX_ARB_H_
 
 #include "core/include/fxcrt/fx_system.h"
 #include "core/include/fxcrt/fx_ucd.h"
 
 class IFX_ArabicChar;
 
 struct FX_ARBFORMTABLE {
-  FX_WCHAR wIsolated;
-  FX_WCHAR wFinal;
-  FX_WCHAR wInitial;
-  FX_WCHAR wMedial;
+  uint16_t wIsolated;
+  uint16_t wFinal;
+  uint16_t wInitial;
+  uint16_t wMedial;
 };
 
 struct FX_ARAALEF {
-  FX_WCHAR wAlef;
-  FX_WCHAR wIsolated;
+  uint16_t wAlef;
+  uint16_t wIsolated;
 };
 
 struct FX_ARASHADDA {
-  FX_WCHAR wShadda;
-  FX_WCHAR wIsolated;
+  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,
@@ skipping 17 matching lines @@
 
 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_INCLUDE_FXCRT_FX_ARB_H_