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

fpdfsdk/fpdf_flatten.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 "public/fpdf_flatten.h"
 
 #include <algorithm>
 
@@ skipping 364 matching lines @@
     if (!pAPStream) {
       CPDF_Dictionary* pAPDic = pAnnotAP->GetDictFor("N");
       if (!pAPDic)
         continue;
 
       if (!sAnnotState.IsEmpty()) {
         pAPStream = pAPDic->GetStreamFor(sAnnotState);
       } else {
         auto it = pAPDic->begin();
         if (it != pAPDic->end()) {
-          CPDF_Object* pFirstObj = it->second.get();
+          CPDF_Object* pFirstObj = it->second;
           if (pFirstObj) {
             if (pFirstObj->IsReference())
               pFirstObj = pFirstObj->GetDirect();
             if (!pFirstObj->IsStream())
               continue;
             pAPStream = pFirstObj->AsStream();
           }
         }
       }
     }
@@ skipping 53 matching lines @@
     sTemp.Format("q %f 0 0 %f %f %f cm /%s Do Q\n", m.a, m.d, m.e, m.f,
                  sFormName.c_str());
     sStream += sTemp;
     pNewXObject->SetData(sStream.raw_str(), sStream.GetLength());
   }
   pPageDict->RemoveFor("Annots");
 
   RectArray.RemoveAll();
   return FLATTEN_SUCCESS;
 }