Add type cast definitions for CPDF_Array.

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 217 matching lines @@
         if (pNextObj) {
           if (!UpdateReference(pNextObj, pDoc, pObjNumberMap))
             pDict->RemoveAt(key);
         } else {
           return FALSE;
         }
       }
       break;
     }
     case PDFOBJ_ARRAY: {
-      CPDF_Array* pArray = (CPDF_Array*)pObj;
+      CPDF_Array* pArray = pObj->AsArray();
       FX_DWORD count = pArray->GetCount();
       for (FX_DWORD i = 0; i < count; ++i) {
         CPDF_Object* pNextObj = pArray->GetElement(i);
         if (!pNextObj)
           return FALSE;
         if (!UpdateReference(pNextObj, pDoc, pObjNumberMap))
           return FALSE;
       }
       break;
     }
@@ skipping 153 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;
 }