Return unique_ptr from CPDF_Object::Clone().

core/fpdfapi/parser/cpdf_object.cpp

Index: core/fpdfapi/parser/cpdf_object.cpp
diff --git a/core/fpdfapi/parser/cpdf_object.cpp b/core/fpdfapi/parser/cpdf_object.cpp
index e9c215ce19b68f62998c022656e57d611e4ab38d..acda334c9ef9b340a716eb01b0985758dd3d491e 100644
--- a/core/fpdfapi/parser/cpdf_object.cpp
+++ b/core/fpdfapi/parser/cpdf_object.cpp
@@ -22,16 +22,17 @@ CPDF_Object* CPDF_Object::GetDirect() const {
   return const_cast<CPDF_Object*>(this);
 }
 
-CPDF_Object* CPDF_Object::CloneObjectNonCyclic(bool bDirect) const {
+std::unique_ptr<CPDF_Object> CPDF_Object::CloneObjectNonCyclic(
+    bool bDirect) const {
   std::set<const CPDF_Object*> visited_objs;
   return CloneNonCyclic(bDirect, &visited_objs);
 }
 
-CPDF_Object* CPDF_Object::CloneDirectObject() const {
+std::unique_ptr<CPDF_Object> CPDF_Object::CloneDirectObject() const {
   return CloneObjectNonCyclic(true);
 }
 
-CPDF_Object* CPDF_Object::CloneNonCyclic(
+std::unique_ptr<CPDF_Object> CPDF_Object::CloneNonCyclic(
     bool bDirect,
     std::set<const CPDF_Object*>* pVisited) const {
   return Clone();