Update CPDF_IndirectObjectHolder APIs for unique objects

core/fpdfdoc/cpvt_fontmap.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 "core/fpdfdoc/cpvt_fontmap.h"
 
 #include "core/fpdfapi/font/cpdf_font.h"
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
@@ skipping 20 matching lines @@
   if (!pDoc || !pResDict)
     return;
 
   CFX_ByteString sFontAlias;
   CPDF_Dictionary* pFormDict = pDoc->GetRoot()->GetDictFor("AcroForm");
   CPDF_Font* pPDFFont = AddNativeInterFormFont(pFormDict, pDoc, sSysFontAlias);
   if (!pPDFFont)
     return;
 
   CPDF_Dictionary* pFontList = pResDict->GetDictFor("Font");
-  if (pFontList && !pFontList->KeyExist(sSysFontAlias)) {
-    pFontList->SetReferenceFor(sSysFontAlias, pDoc,
-                               pPDFFont->GetFontDict()->GetObjNum());
-  }
+  if (pFontList && !pFontList->KeyExist(sSysFontAlias))
+    pFontList->SetReferenceFor(sSysFontAlias, pDoc, pPDFFont->GetFontDict());
+
   pSysFont = pPDFFont;
 }
 
 CPDF_Font* CPVT_FontMap::GetPDFFont(int32_t nFontIndex) {
   switch (nFontIndex) {
     case 0:
       return m_pDefFont;
     case 1:
       if (!m_pSysFont) {
         GetAnnotSysPDFFont(m_pDocument, m_pResDict, m_pSysFont,
@@ skipping 29 matching lines @@
 
 int32_t CPVT_FontMap::CharCodeFromUnicode(int32_t nFontIndex, uint16_t word) {
   ASSERT(false);
   return 0;
 }
 
 int32_t CPVT_FontMap::CharSetFromUnicode(uint16_t word, int32_t nOldCharset) {
   ASSERT(false);
   return FXFONT_ANSI_CHARSET;
 }