Get rid of NULLs in core/

core/fpdfapi/fpdf_parser/cpdf_crypto_handler.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 "core/fpdfapi/fpdf_parser/cpdf_crypto_handler.h"
 
 #include <time.h>
 
@@ skipping 310 matching lines @@
 FX_BOOL CPDF_CryptoHandler::EncryptContent(uint32_t objnum,
                                            uint32_t gennum,
                                            const uint8_t* src_buf,
                                            uint32_t src_size,
                                            uint8_t* dest_buf,
                                            uint32_t& dest_size) {
   CryptBlock(TRUE, objnum, gennum, src_buf, src_size, dest_buf, dest_size);
   return TRUE;
 }
 CPDF_CryptoHandler::CPDF_CryptoHandler() {
-  m_pAESContext = NULL;
+  m_pAESContext = nullptr;
   m_Cipher = FXCIPHER_NONE;
   m_KeyLen = 0;
 }
 CPDF_CryptoHandler::~CPDF_CryptoHandler() {
   FX_Free(m_pAESContext);
 }