Put CJBig2_SymbolDict's images in a CJBig2_List container.

core/src/fxcodec/jbig2/JBig2_Context.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_SRC_FXCODEC_JBIG2_JBIG2_CONTEXT_H_
 #define CORE_SRC_FXCODEC_JBIG2_JBIG2_CONTEXT_H_
 
 #include <list>
 #include <utility>
 
 #include "../../../../third_party/base/nonstd_unique_ptr.h"
 #include "../../../include/fxcodec/fx_codec_def.h"
 #include "JBig2_List.h"
 #include "JBig2_Page.h"
 #include "JBig2_Segment.h"
 
+class CJBig2_ArithDecoder;
 class CJBig2_GRDProc;
 class IFX_Pause;
 
 using CJBig2_CachePair = std::pair<const uint8_t*, CJBig2_SymbolDict*>;
 
 #define JBIG2_SUCCESS 0
 #define JBIG2_FAILED -1
 #define JBIG2_ERROR_TOO_SHORT -2
 #define JBIG2_ERROR_FATAL -3
 #define JBIG2_END_OF_PAGE 2
@@ skipping 92 matching lines @@
   nonstd::unique_ptr<CJBig2_ArithDecoder> m_pArithDecoder;
   nonstd::unique_ptr<CJBig2_GRDProc> m_pGRD;
   JBig2ArithCtx* m_gbContext;
   nonstd::unique_ptr<CJBig2_Segment> m_pSegment;
   FX_DWORD m_dwOffset;
   JBig2RegionInfo m_ri;
   std::list<CJBig2_CachePair>* const m_pSymbolDictCache;
 };
 
 #endif  // CORE_SRC_FXCODEC_JBIG2_JBIG2_CONTEXT_H_