Update CPDF_IndirectObjectHolder APIs for unique objects

fpdfsdk/cpdfsdk_widget.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 "fpdfsdk/cpdfsdk_widget.h"
 
 #include <memory>
 
@@ skipping 1793 matching lines @@
   }
 
   CPDF_Document* pDoc = m_pPageView->GetPDFDocument();
   CPDF_Dictionary* pStreamResList = pStreamDict->GetDictFor("Resources");
   if (!pStreamResList) {
     pStreamResList = new CPDF_Dictionary(pDoc->GetByteStringPool());
     pStreamDict->SetFor("Resources", pStreamResList);
   }
 
   CPDF_Dictionary* pXObject = new CPDF_Dictionary(pDoc->GetByteStringPool());
-  pXObject->SetReferenceFor(sImageAlias, pDoc, pImage->GetObjNum());
+  pXObject->SetReferenceFor(sImageAlias, pDoc, pImage);
   pStreamResList->SetFor("XObject", pXObject);
 }
 
 void CPDFSDK_Widget::RemoveAppearance(const CFX_ByteString& sAPType) {
   if (CPDF_Dictionary* pAPDict = m_pAnnot->GetAnnotDict()->GetDictFor("AP"))
     pAPDict->RemoveFor(sAPType);
 }
 
 FX_BOOL CPDFSDK_Widget::OnAAction(CPDF_AAction::AActionType type,
                                   PDFSDK_FieldAction& data,
@@ skipping 98 matching lines @@
     return FALSE;
 
   if (!IsVisible())
     return FALSE;
 
   if ((GetFieldFlags() & FIELDFLAG_READONLY) == FIELDFLAG_READONLY)
     return FALSE;
 
   return TRUE;
 }