Revert "Revert "Add type cast definitions for CPDF_Reference.""

fpdfsdk/src/fpdfppo.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_ppo.h"
 #include "../../third_party/base/nonstd_unique_ptr.h"
 #include "../include/fsdk_define.h"
 
@@ skipping 189 matching lines @@
     pp = ToDictionary(pp->GetElement("Parent")->GetDirect());
   }
   return nullptr;
 }
 
 FX_BOOL CPDF_PageOrganizer::UpdateReference(CPDF_Object* pObj,
                                             CPDF_Document* pDoc,
                                             ObjectNumberMap* pObjNumberMap) {
   switch (pObj->GetType()) {
     case PDFOBJ_REFERENCE: {
-      CPDF_Reference* pReference = (CPDF_Reference*)pObj;
+      CPDF_Reference* pReference = pObj->AsReference();
       FX_DWORD newobjnum = GetNewObjId(pDoc, pObjNumberMap, pReference);
       if (newobjnum == 0)
         return FALSE;
       pReference->SetRef(pDoc, newobjnum);
       break;
     }
     case PDFOBJ_DICTIONARY: {
       CPDF_Dictionary* pDict = pObj->AsDictionary();
 
       FX_POSITION pos = pDict->GetStartPos();
@@ skipping 181 matching lines @@
   if (!pSrcDict)
     return FALSE;
 
   CPDF_Dictionary* pDstDict = pDstDoc->GetRoot();
   if (!pDstDict)
     return FALSE;
 
   pDstDict->SetAt(FX_BSTRC("ViewerPreferences"), pSrcDict->Clone(TRUE));
   return TRUE;
 }