Make CPDF_Dictionary methods take CFX_ByteString arguments

core/fpdfdoc/doc_basic.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/include/cpdf_array.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
 #include "core/fpdfdoc/doc_utils.h"
 #include "core/fpdfdoc/include/fpdf_doc.h"
@@ skipping 464 matching lines @@
       break;
     }
     n--;
   }
   if (pValue) {
     pValue = pValue->GetDirect();
     if (CPDF_Dictionary* pLabel = pValue->AsDictionary()) {
       if (pLabel->KeyExist("P")) {
         wsLabel += pLabel->GetUnicodeTextBy("P");
       }
-      CFX_ByteString bsNumberingStyle = pLabel->GetStringBy("S", NULL);
+      CFX_ByteString bsNumberingStyle = pLabel->GetStringBy("S", nullptr);
       int nLabelNum = nPage - n + pLabel->GetIntegerBy("St", 1);
       CFX_WideString wsNumPortion =
           _GetLabelNumPortion(nLabelNum, bsNumberingStyle);
       wsLabel += wsNumPortion;
       return wsLabel;
     }
   }
   wsLabel.Format(L"%d", nPage + 1);
   return wsLabel;
 }
@@ skipping 17 matching lines @@
   bsLbl = bsOrig;
   int nPage = FXSYS_atoi(bsLbl.c_str());
   if (nPage > 0 && nPage <= nPages) {
     return nPage;
   }
   return -1;
 }
 int32_t CPDF_PageLabel::GetPageByLabel(const CFX_WideStringC& wsLabel) const {
   return GetPageByLabel(PDF_EncodeText(wsLabel.c_str()).AsStringC());
 }