Make indirect object holder private.

core/fpdfapi/fpdf_parser/cfdf_document.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/cfdf_document.h"
 
 #include "core/fpdfapi/fpdf_edit/include/cpdf_creator.h"
 #include "core/fpdfapi/fpdf_parser/cpdf_syntax_parser.h"
@@ skipping 66 matching lines @@
               ToDictionary(parser.GetObject(this, 0, 0, true))) {
         m_pRootDict = pMainDict->GetDictBy("Root");
         pMainDict->Release();
       }
       break;
     }
   }
 }
 
 FX_BOOL CFDF_Document::WriteBuf(CFX_ByteTextBuf& buf) const {
-  if (!m_pRootDict) {
+  if (!m_pRootDict)
     return FALSE;
-  }
+
   buf << "%FDF-1.2\r\n";
-  for (const auto& pair : m_IndirectObjs) {
+  for (const auto& pair : *this)
     buf << pair.first << " 0 obj\r\n" << pair.second << "\r\nendobj\r\n\r\n";
-  }
+
   buf << "trailer\r\n<</Root " << m_pRootDict->GetObjNum()
       << " 0 R>>\r\n%%EOF\r\n";
   return TRUE;
 }