Make CFX_StockFontArray more robust.

core/src/fpdfapi/fpdf_font/font_int.h

Index: core/src/fpdfapi/fpdf_font/font_int.h
diff --git a/core/src/fpdfapi/fpdf_font/font_int.h b/core/src/fpdfapi/fpdf_font/font_int.h
index a2d544afe993c85f21da5b628d34d66e6718c8f6..56454286df1676d228998007e5b8acfdeab54bfd 100644
--- a/core/src/fpdfapi/fpdf_font/font_int.h
+++ b/core/src/fpdfapi/fpdf_font/font_int.h
@@ -31,7 +31,6 @@ public:
     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;
@@ -41,6 +40,8 @@ public:
         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 {