Update CPDF_IndirectObjectHolder APIs for unique objects

core/fpdfapi/parser/cpdf_data_avail.cpp

Index: core/fpdfapi/parser/cpdf_data_avail.cpp
diff --git a/core/fpdfapi/parser/cpdf_data_avail.cpp b/core/fpdfapi/parser/cpdf_data_avail.cpp
index 980c94d3250dbe6707ce6663b9a78fc53e0eb7cd..9629c204bbc90c4703dfedeaff100d6e3977bf43 100644
--- a/core/fpdfapi/parser/cpdf_data_avail.cpp
+++ b/core/fpdfapi/parser/cpdf_data_avail.cpp
@@ -1771,8 +1771,9 @@ CPDF_Dictionary* CPDF_DataAvail::GetPage(int index) {
       if (!pPageDict)
         return nullptr;
 
-      if (!m_pDocument->ReplaceIndirectObjectIfHigherGeneration(dwObjNum,
-                                                                pPageDict)) {
+      // TODO(tsepez): check |pPageDict| ownership.
+      if (!m_pDocument->ReplaceIndirectObjectIfHigherGeneration(
+              dwObjNum, UniqueObject(pPageDict))) {
         return nullptr;
       }
       return pPageDict->GetDict();