Remove FX_DWORD from core/ and delete definition

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 FX_DWORD GetPermissions() = 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_