Make CPDF_Object containers hold objects via unique pointers

core/fpdfapi/parser/cpdf_parser.cpp

Index: core/fpdfapi/parser/cpdf_parser.cpp
diff --git a/core/fpdfapi/parser/cpdf_parser.cpp b/core/fpdfapi/parser/cpdf_parser.cpp
index c29ae18da2ac267353c23fde29162d7e669b6456..40a615fa472eb3ab9562ef9df6f845b95362afb1 100644
--- a/core/fpdfapi/parser/cpdf_parser.cpp
+++ b/core/fpdfapi/parser/cpdf_parser.cpp
@@ -826,7 +826,7 @@ FX_BOOL CPDF_Parser::RebuildCrossRef() {
                         auto it = pTrailer->begin();
                         while (it != pTrailer->end()) {
                           const CFX_ByteString& key = it->first;
-                          CPDF_Object* pElement = it->second;
+                          CPDF_Object* pElement = it->second.get();
                           ++it;
                           uint32_t dwObjNum =
                               pElement ? pElement->GetObjNum() : 0;