Split off IPDF_CryptoHandler into its own .cpp/.h files

core/include/fpdfapi/fpdf_serial.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_INCLUDE_FPDFAPI_FPDF_SERIAL_H_
 #define CORE_INCLUDE_FPDFAPI_FPDF_SERIAL_H_
 
 #include "core/include/fpdfapi/fpdf_page.h"
@@ skipping 26 matching lines @@
   FX_BOOL m_bCompress;
 
   FX_BOOL m_bSecurityChanged;
 
   CPDF_Dictionary* m_pEncryptDict;
   FX_DWORD m_dwEnryptObjNum;
   FX_BOOL m_bEncryptCloned;
 
   FX_BOOL m_bStandardSecurity;
 
-  CPDF_CryptoHandler* m_pCryptoHandler;
+  IPDF_CryptoHandler* m_pCryptoHandler;
   FX_BOOL m_bNewCrypto;
 
   FX_BOOL m_bEncryptMetadata;
 
   CPDF_Object* m_pMetadata;
 
   CPDF_XRefStream* m_pXRefStream;
 
   int32_t m_ObjectStreamSize;
 
@@ skipping 21 matching lines @@
                          FX_BOOL bEncrypt = TRUE);
   int32_t WriteIndirectObjectToStream(const CPDF_Object* pObj);
   int32_t WriteIndirectObj(FX_DWORD objnum, const CPDF_Object* pObj);
   int32_t WriteIndirectObjectToStream(FX_DWORD objnum,
                                       const uint8_t* pBuffer,
                                       FX_DWORD dwSize);
   int32_t AppendObjectNumberToXRef(FX_DWORD objnum);
   void InitID(FX_BOOL bDefault = TRUE);
   int32_t WriteStream(const CPDF_Object* pStream,
                       FX_DWORD objnum,
-                      CPDF_CryptoHandler* pCrypto);
+                      IPDF_CryptoHandler* pCrypto);
 
   int32_t m_iStage;
   FX_DWORD m_dwFlags;
   FX_POSITION m_Pos;
   FX_FILESIZE m_XrefStart;
   CFX_FileSizeListArray m_ObjectOffset;
   CFX_DWordArray m_NewObjNumArray;
   CPDF_Array* m_pIDArray;
   int32_t m_FileVersion;
 
   friend class CPDF_ObjectStream;
   friend class CPDF_XRefStream;
 };
 
 #endif  // CORE_INCLUDE_FPDFAPI_FPDF_SERIAL_H_