Make CPDF_IndirectObjectHolder use unique_ptr to objects

core/fpdfapi/fpdf_edit/fpdf_edit_create.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_edit/editint.h"
 
 #include <vector>
 
@@ skipping 1347 matching lines @@
     m_ObjectOffset.Add(dwStart, j - dwStart);
     dwStart = j;
   }
 }
 
 void CPDF_Creator::InitNewObjNumOffsets() {
   FX_BOOL bIncremental = (m_dwFlags & FPDFCREATE_INCREMENTAL) != 0;
   FX_BOOL bNoOriginal = (m_dwFlags & FPDFCREATE_NO_ORIGINAL) != 0;
   for (const auto& pair : *m_pDocument) {
     const uint32_t objnum = pair.first;
-    const CPDF_Object* pObj = pair.second;
+    const CPDF_Object* pObj = pair.second.get();
     if (bIncremental || pObj->GetObjNum() == CPDF_Object::kInvalidObjNum)
       continue;
     if (m_pParser && m_pParser->IsValidObjectNumber(objnum) &&
         m_pParser->GetObjectType(objnum)) {
       continue;
     }
     AppendNewObjNum(objnum);
   }
 
   int32_t iCount = m_NewObjNumArray.GetSize();
@@ skipping 637 matching lines @@
   m_pCryptoHandler = nullptr;
 }
 void CPDF_Creator::ResetStandardSecurity() {
   if (!m_bLocalCryptoHandler)
     return;
 
   delete m_pCryptoHandler;
   m_pCryptoHandler = nullptr;
   m_bLocalCryptoHandler = FALSE;
 }