Merge to XFA: Add type cast definitions for CPDF_Stream.

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 "../include/fsdk_define.h"
 #include "../include/fpdfxfa/fpdfxfa_doc.h"
 
@@ skipping 237 matching lines @@
         CPDF_Object* pNextObj = pArray->GetElement(i);
         if (pNextObj) {
           if (!UpdateReference(pNextObj, pDoc, pMapPtrToPtr))
             return FALSE;
         } else
           return FALSE;
       }
       break;
     }
     case PDFOBJ_STREAM: {
-      CPDF_Stream* pStream = (CPDF_Stream*)pObj;
+      CPDF_Stream* pStream = pObj->AsStream();
       CPDF_Dictionary* pDict = pStream->GetDict();
       if (pDict) {
         if (!UpdateReference(pDict, pDoc, pMapPtrToPtr))
           return FALSE;
       } else
         return FALSE;
       break;
     }
     default:
       break;
@@ skipping 143 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;
 }