Fix a few more warnings in chromium_code mode.

core/src/fpdfapi/fpdf_parser/fpdf_parser_encrypt.cpp

 // 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
 
 #include <time.h>
 #include "../../../include/fpdfapi/fpdf_parser.h"
 #include "../../../include/fdrm/fx_crypt.h"
 const FX_BYTE defpasscode[32] = {
@@ skipping 88 matching lines @@
     }
     return CheckPassword(password, password.GetLength(), FALSE, m_EncryptKey, key_len);
 }
 FX_DWORD CPDF_StandardSecurityHandler::GetPermissions()
 {
     return m_Permissions;
 }
 static FX_BOOL _LoadCryptInfo(CPDF_Dictionary* pEncryptDict, FX_BSTR name, int& cipher, int& keylen)
 {
     int Version = pEncryptDict->GetInteger(FX_BSTRC("V"));
-    int Revision = pEncryptDict->GetInteger(FX_BSTRC("R"));
     cipher = FXCIPHER_RC4;
     keylen = 0;
     if (Version >= 4) {
         CPDF_Dictionary* pCryptFilters = pEncryptDict->GetDict(FX_BSTRC("CF"));
         if (pCryptFilters == NULL) {
             return FALSE;
         }
         if (name == FX_BSTRC("Identity")) {
             cipher = FXCIPHER_NONE;
         } else {
@@ skipping 831 matching lines @@
     m_pAESContext = NULL;
     m_Cipher = FXCIPHER_NONE;
     m_KeyLen = 0;
 }
 CPDF_StandardCryptoHandler::~CPDF_StandardCryptoHandler()
 {
     if (m_pAESContext) {
         FX_Free(m_pAESContext);
     }
 }