security: clean up KeyChain and SigningInfo APIs

refs #4804

Change-Id: I55ad2b61f05aec8c75d5f6bafc4eea8e1e1100e9
diff --git a/tests/unit/metadata-object.t.cpp b/tests/unit/metadata-object.t.cpp
index 6074c59..364600e 100644
--- a/tests/unit/metadata-object.t.cpp
+++ b/tests/unit/metadata-object.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2013-2019 Regents of the University of California.
+ * Copyright (c) 2013-2020 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -62,7 +62,7 @@
 
   // pass metadata version number
   const Data data1 = metadata1.makeData(metadataFullName.getPrefix(-2), m_keyChain,
-                                        KeyChain::getDefaultSigningInfo(), metadataVerNo);
+                                        security::SigningInfo(), metadataVerNo);
 
   BOOST_CHECK_EQUAL(metadata1.getVersionedName(), versionedContentName);
   BOOST_CHECK_EQUAL(data1.getName(), metadataFullName);