Fix stack overflow in object Clone() functions

core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h

 // Copyright 2016 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_FPDFAPI_FPDF_PARSER_INCLUDE_CPDF_DICTIONARY_H_
 #define CORE_FPDFAPI_FPDF_PARSER_INCLUDE_CPDF_DICTIONARY_H_
 
 #include <map>
+#include <set>
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_object.h"
 #include "core/fxcrt/include/fx_coordinates.h"
 #include "core/fxcrt/include/fx_string.h"
 
 class CPDF_IndirectObjectHolder;
 
 class CPDF_Dictionary : public CPDF_Object {
  public:
   using iterator = std::map<CFX_ByteString, CPDF_Object*>::iterator;
   using const_iterator = std::map<CFX_ByteString, CPDF_Object*>::const_iterator;
 
   CPDF_Dictionary();
 
   // CPDF_Object.
   Type GetType() const override;
-  CPDF_Object* Clone(FX_BOOL bDirect = FALSE) const override;
+  CPDF_Object* Clone() const override;
   CPDF_Dictionary* GetDict() const override;
   bool IsDictionary() const override;
   CPDF_Dictionary* AsDictionary() override;
   const CPDF_Dictionary* AsDictionary() const override;
 
   size_t GetCount() const { return m_Map.size(); }
   CPDF_Object* GetObjectBy(const CFX_ByteString& key) const;
   CPDF_Object* GetDirectObjectBy(const CFX_ByteString& key) const;
   CFX_ByteString GetStringBy(const CFX_ByteString& key) const;
   CFX_ByteString GetStringBy(const CFX_ByteString& key,
@@ skipping 40 matching lines @@
   void ReplaceKey(const CFX_ByteString& oldkey, const CFX_ByteString& newkey);
 
   iterator begin() { return m_Map.begin(); }
   iterator end() { return m_Map.end(); }
   const_iterator begin() const { return m_Map.begin(); }
   const_iterator end() const { return m_Map.end(); }
 
  protected:
   ~CPDF_Dictionary() override;
 
+  CPDF_Object* CloneNonCyclic(
+      bool bDirect,
+      std::set<const CPDF_Object*>* visited) const override;
+
   std::map<CFX_ByteString, CPDF_Object*> m_Map;
 };
 
 #endif  // CORE_FPDFAPI_FPDF_PARSER_INCLUDE_CPDF_DICTIONARY_H_