Pass object to ReplaceIndirectObjectIfHigherGeneration() by unique_ptr.

core/fpdfapi/parser/cpdf_indirect_object_holder.h

Index: core/fpdfapi/parser/cpdf_indirect_object_holder.h
diff --git a/core/fpdfapi/parser/cpdf_indirect_object_holder.h b/core/fpdfapi/parser/cpdf_indirect_object_holder.h
index 83a31535c4ada46bbaefdfb906aa2515de509bf7..fcd77215ebd07ccdb7ba13e8828001f5a56407a1 100644
--- a/core/fpdfapi/parser/cpdf_indirect_object_holder.h
+++ b/core/fpdfapi/parser/cpdf_indirect_object_holder.h
@@ -28,8 +28,9 @@ class CPDF_IndirectObjectHolder {
 
   // Take ownership of |pObj|.
   uint32_t AddIndirectObject(CPDF_Object* pObj);
-  bool ReplaceIndirectObjectIfHigherGeneration(uint32_t objnum,
-                                               CPDF_Object* pObj);
+  bool ReplaceIndirectObjectIfHigherGeneration(
+      uint32_t objnum,
+      std::unique_ptr<CPDF_Object> pObj);
 
   uint32_t GetLastObjNum() const { return m_LastObjNum; }
   void SetLastObjNum(uint32_t objnum) { m_LastObjNum = objnum; }