Put CJBig2_SymbolDict's images in a CJBig2_List container.

core/src/fxcodec/jbig2/JBig2_SymbolDict.h

Index: core/src/fxcodec/jbig2/JBig2_SymbolDict.h
diff --git a/core/src/fxcodec/jbig2/JBig2_SymbolDict.h b/core/src/fxcodec/jbig2/JBig2_SymbolDict.h
index c8e39dc84576232888818d37cf3dbeb5d6c91062..577bfbc2f21a79de07c64ae6f89f24d13307709b 100644
--- a/core/src/fxcodec/jbig2/JBig2_SymbolDict.h
+++ b/core/src/fxcodec/jbig2/JBig2_SymbolDict.h
@@ -9,9 +9,10 @@
 
 #include "../../../../third_party/base/nonstd_unique_ptr.h"
 #include "../../../include/fxcrt/fx_basic.h"
-#include "JBig2_ArithDecoder.h"
+#include "JBig2_List.h"
 
 class CJBig2_Image;
+struct JBig2ArithCtx;
 
 class CJBig2_SymbolDict {
  public:
@@ -20,12 +21,19 @@ class CJBig2_SymbolDict {
 
   nonstd::unique_ptr<CJBig2_SymbolDict> DeepCopy() const;
 
+  // Takes ownership of |image|.
+  void AddImage(CJBig2_Image* image) { m_SDEXSYMS.push_back(image); }
+
+  size_t NumImages() const { return m_SDEXSYMS.size(); }
+  CJBig2_Image* GetImage(size_t index) const { return m_SDEXSYMS.get(index); }
+
  public:
-  FX_DWORD SDNUMEXSYMS;
-  CJBig2_Image** SDEXSYMS;
   FX_BOOL m_bContextRetained;
   JBig2ArithCtx* m_gbContext;
   JBig2ArithCtx* m_grContext;
+
+ private:
+  CJBig2_List<CJBig2_Image> m_SDEXSYMS;
 };
 
 #endif  // CORE_SRC_FXCODEC_JBIG2_JBIG2_SYMBOLDICT_H_