Fix another former FX_BSTRC usage with embedded NULs.

core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.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 "parser_int.h"
 
 #include <set>
 #include <utility>
@@ skipping 1164 matching lines @@
   if (pResult == NULL) {
     return TRUE;
   }
   if ((FX_FILESIZE*)pResult - (FX_FILESIZE*)m_SortedOffset.GetData() ==
       m_SortedOffset.GetSize() - 1) {
     return FALSE;
   }
   FX_FILESIZE size = ((FX_FILESIZE*)pResult)[1] - pos;
   FX_FILESIZE SavedPos = m_Syntax.SavePos();
   m_Syntax.RestorePos(pos);
-  bForm = m_Syntax.SearchMultiWord("/Form\0stream", TRUE, size) == 0;
+  const char kFormStream[] = "/Form\0stream";
+  const CFX_ByteStringC kFormStreamStr(kFormStream, sizeof(kFormStream) - 1);
+  bForm = m_Syntax.SearchMultiWord(kFormStreamStr, TRUE, size) == 0;
   m_Syntax.RestorePos(SavedPos);
   return TRUE;
 }
 
 CPDF_Object* CPDF_Parser::ParseIndirectObject(CPDF_IndirectObjects* pObjList,
                                               FX_DWORD objnum,
                                               PARSE_CONTEXT* pContext) {
   if (objnum >= (FX_DWORD)m_CrossRef.GetSize())
     return nullptr;
 
@@ skipping 3803 matching lines @@
   if (!m_pLinearizedDict)
     return -1;
   CPDF_Array* pRange = m_pLinearizedDict->GetArray("H");
   if (!pRange)
     return -1;
   CPDF_Object* pStreamLen = pRange->GetElementValue(1);
   if (!pStreamLen)
     return -1;
   return pStreamLen->GetInteger();
 }