Make indirect object holder private.

core/fpdfapi/fpdf_parser/cpdf_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/cpdf_document.h"
 
 #include <memory>
 #include <set>
@@ skipping 711 matching lines @@
 #ifndef PDF_ENABLE_XFA
     return 0;
 #else  // PDF_ENABLE_XFA
     return 0xFFFFFFFF;
 #endif
   }
   return m_pParser->GetPermissions();
 }
 
 FX_BOOL CPDF_Document::IsFormStream(uint32_t objnum, FX_BOOL& bForm) const {
-  auto it = m_IndirectObjs.find(objnum);
-  if (it != m_IndirectObjs.end()) {
-    CPDF_Stream* pStream = it->second->AsStream();
+  CPDF_Object* pObj = GetIndirectObject(objnum);
+  if (pObj) {
+    CPDF_Stream* pStream = pObj->AsStream();
     bForm = pStream && pStream->GetDict()->GetStringBy("Subtype") == "Form";
     return TRUE;
   }
   if (!m_pParser) {
     bForm = FALSE;
     return TRUE;
   }
   return m_pParser->IsFormStream(objnum, bForm);
 }
 
@@ skipping 698 matching lines @@
     }
   }
   pFontDesc->SetAtInteger("StemV", fStemV);
   AddIndirectObject(pFontDesc);
   pFontDict->SetAtReference("FontDescriptor", this, pFontDesc);
   CFRelease(traits);
   CFRelease(languages);
   return LoadFont(pBaseDict);
 }
 #endif  // _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_