Remove IPDF_CryptoHandler and IPDF_SecurityHandler.

core/fpdfapi/fpdf_parser/ipdf_crypto_handler.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_IPDF_CRYPTO_HANDLER_H_
-#define CORE_FPDFAPI_FPDF_PARSER_IPDF_CRYPTO_HANDLER_H_
-
-#include "core/fxcrt/include/fx_basic.h"
-
-class CPDF_Dictionary;
-class IPDF_SecurityHandler;
-
-class IPDF_CryptoHandler {
- public:
-  virtual ~IPDF_CryptoHandler();
-
-  virtual FX_BOOL Init(CPDF_Dictionary* pEncryptDict,
-                       IPDF_SecurityHandler* pSecurityHandler) = 0;
-
-  virtual uint32_t DecryptGetSize(uint32_t src_size) = 0;
-  virtual void* DecryptStart(uint32_t objnum, uint32_t gennum) = 0;
-  virtual FX_BOOL DecryptStream(void* context,
-                                const uint8_t* src_buf,
-                                uint32_t src_size,
-                                CFX_BinaryBuf& dest_buf) = 0;
-
-  virtual FX_BOOL DecryptFinish(void* context, CFX_BinaryBuf& dest_buf) = 0;
-  virtual uint32_t EncryptGetSize(uint32_t objnum,
-                                  uint32_t version,
-                                  const uint8_t* src_buf,
-                                  uint32_t src_size) = 0;
-
-  virtual FX_BOOL EncryptContent(uint32_t objnum,
-                                 uint32_t version,
-                                 const uint8_t* src_buf,
-                                 uint32_t src_size,
-                                 uint8_t* dest_buf,
-                                 uint32_t& dest_size) = 0;
-
-  void Decrypt(uint32_t objnum, uint32_t version, CFX_ByteString& str);
-};
-
-#endif  // CORE_FPDFAPI_FPDF_PARSER_IPDF_CRYPTO_HANDLER_H_