Change CPDF_SyntaxParser::GetNextWord() to not pass by non-const ref.

core/src/fpdfapi/fpdf_parser/fpdf_parser_fdf.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/include/fpdfapi/fpdf_serial.h"
 
 CFDF_Document::CFDF_Document() : CPDF_IndirectObjects(NULL) {
   m_pRootDict = NULL;
@@ skipping 28 matching lines @@
 CFDF_Document* CFDF_Document::ParseMemory(const uint8_t* pData, FX_DWORD size) {
   return CFDF_Document::ParseFile(FX_CreateMemoryStream((uint8_t*)pData, size),
                                   TRUE);
 }
 void CFDF_Document::ParseStream(IFX_FileRead* pFile, FX_BOOL bOwnFile) {
   m_pFile = pFile;
   m_bOwnFile = bOwnFile;
   CPDF_SyntaxParser parser;
   parser.InitParser(m_pFile, 0);
   while (1) {
-    FX_BOOL bNumber;
-    CFX_ByteString word = parser.GetNextWord(bNumber);
+    bool bNumber;
+    CFX_ByteString word = parser.GetNextWord(&bNumber);
     if (bNumber) {
       FX_DWORD objnum = FXSYS_atoi(word);
-      word = parser.GetNextWord(bNumber);
+      word = parser.GetNextWord(&bNumber);
       if (!bNumber) {
         break;
       }
-      word = parser.GetNextWord(bNumber);
+      word = parser.GetNextWord(nullptr);
       if (word != "obj") {
         break;
       }
       CPDF_Object* pObj = parser.GetObject(this, objnum, 0, nullptr, true);
       if (!pObj) {
         break;
       }
       InsertIndirectObject(objnum, pObj);
-      word = parser.GetNextWord(bNumber);
+      word = parser.GetNextWord(nullptr);
       if (word != "endobj") {
         break;
       }
     } else {
       if (word != "trailer") {
         break;
       }
       if (CPDF_Dictionary* pMainDict =
               ToDictionary(parser.GetObject(this, 0, 0, nullptr, true))) {
         m_pRootDict = pMainDict->GetDict("Root");
@@ skipping 93 matching lines @@
     result += wsFileName[1];
     result += ':';
     result += ChangeSlash(wsFileName.c_str() + 2);
     return result;
   }
   CFX_WideString result;
   result += '\\';
   result += ChangeSlash(wsFileName.c_str());
   return result;
 }