Revert "Make CPDF_Object containers hold objects via unique pointers."

core/fpdfapi/parser/cpdf_parser.cpp

 // Copyright 2016 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/parser/cpdf_parser.h"
 
 #include <vector>
 
@@ skipping 808 matching lines @@
                           pStream ? pStream->GetDict() : pObj->AsDictionary()) {
                     if (m_pTrailer) {
                       CPDF_Object* pRoot = pTrailer->GetObjectFor("Root");
                       CPDF_Reference* pRef = ToReference(pRoot);
                       if (!pRoot ||
                           (pRef && IsValidObjectNumber(pRef->GetRefObjNum()) &&
                            m_ObjectInfo[pRef->GetRefObjNum()].pos != 0)) {
                         auto it = pTrailer->begin();
                         while (it != pTrailer->end()) {
                           const CFX_ByteString& key = it->first;
-                          CPDF_Object* pElement = it->second.get();
+                          CPDF_Object* pElement = it->second;
                           ++it;
                           uint32_t dwObjNum =
                               pElement ? pElement->GetObjNum() : 0;
                           if (dwObjNum) {
                             m_pTrailer->SetReferenceFor(key, m_pDocument,
                                                         dwObjNum);
                           } else {
                             m_pTrailer->SetFor(key, pElement->Clone());
                           }
                         }
@@ skipping 778 matching lines @@
   if (!LoadLinearizedAllCrossRefV4(m_LastXRefOffset, m_dwXrefStartObjNum) &&
       !LoadLinearizedAllCrossRefV5(m_LastXRefOffset)) {
     m_LastXRefOffset = 0;
     m_pSyntax->m_MetadataObjnum = dwSaveMetadataObjnum;
     return FORMAT_ERROR;
   }
 
   m_pSyntax->m_MetadataObjnum = dwSaveMetadataObjnum;
   return SUCCESS;
 }