Remove IPDF_CryptoHandler and IPDF_SecurityHandler.

core/fpdfapi/fpdf_parser/ipdf_security_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_SECURITY_HANDLER_H_
-#define CORE_FPDFAPI_FPDF_PARSER_IPDF_SECURITY_HANDLER_H_
-
-#include "core/fxcrt/include/fx_system.h"
-
-class CPDF_Parser;
-class CPDF_Dictionary;
-class IPDF_CryptoHandler;
-
-#define FXCIPHER_NONE 0
-#define FXCIPHER_RC4 1
-#define FXCIPHER_AES 2
-#define FXCIPHER_AES2 3
-
-class IPDF_SecurityHandler {
- public:
-  virtual ~IPDF_SecurityHandler();
-  virtual FX_BOOL OnInit(CPDF_Parser* pParser,
-                         CPDF_Dictionary* pEncryptDict) = 0;
-
-  virtual uint32_t GetPermissions() = 0;
-  virtual FX_BOOL GetCryptInfo(int& cipher,
-                               const uint8_t*& buffer,
-                               int& keylen) = 0;
-
-  virtual FX_BOOL IsMetadataEncrypted() = 0;
-  virtual IPDF_CryptoHandler* CreateCryptoHandler() = 0;
-};
-
-#endif  // CORE_FPDFAPI_FPDF_PARSER_IPDF_SECURITY_HANDLER_H_