Make CFX_StockFontArray more robust.

core/src/fpdfapi/fpdf_font/font_int.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
 
 typedef void* FXFT_Library;
 class CPDF_CMapManager 
 {
 public:
@@ skipping 13 matching lines @@
 };
 class CPDF_FontGlobals 
 {
 public:
     CPDF_FontGlobals();
     ~CPDF_FontGlobals();
     void                                ClearAll();
     void                                Clear(void* key);
     CPDF_Font*                  Find(void* key, int index);
     void                                Set(void* key, int index, CPDF_Font* pFont);
-    CFX_MapPtrToPtr             m_pStockMap;
     CPDF_CMapManager    m_CMapManager;
     struct {
         const struct FXCMAP_CMap*       m_pMapList;
         int                             m_Count;
     } m_EmbeddedCharsets[NUMBER_OF_CIDSETS];
     struct {
         const FX_WORD*  m_pMap;
         int                             m_Count;
     } m_EmbeddedToUnicodes[NUMBER_OF_CIDSETS];
+private:
+    CFX_MapPtrToPtr             m_pStockMap;
     FX_LPBYTE                   m_pContrastRamps;
 };
 struct _CMap_CodeRange {
     int                 m_CharSize;
     FX_BYTE             m_Lower[4];
     FX_BYTE             m_Upper[4];
 };
 class CPDF_CMapParser 
 {
 public:
@@ skipping 108 matching lines @@
     CFX_CMapDWordToDWord        m_Map;
     CPDF_CID2UnicodeMap*        m_pBaseMap;
     CFX_WideTextBuf                     m_MultiCharBuf;
 };
 class CPDF_FontCharMap : public CFX_CharMap
 {
 public:
     CPDF_FontCharMap(CPDF_Font* pFont);
     CPDF_Font*          m_pFont;
 };