chunks+poke+ping: use PendingInterestHandle and RegisteredPrefixHandle

refs #4316, #3919

Change-Id: Ia95362067a9024964cf67543c76375144b8a2782
diff --git a/tools/chunks/catchunks/data-fetcher.hpp b/tools/chunks/catchunks/data-fetcher.hpp
index 5b66450..53e32c0 100644
--- a/tools/chunks/catchunks/data-fetcher.hpp
+++ b/tools/chunks/catchunks/data-fetcher.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2016-2018, Regents of the University of California,
+ * Copyright (c) 2016-2019, Regents of the University of California,
  *                          Colorado State University,
  *                          University Pierre & Marie Curie, Sorbonne University.
  *
@@ -110,7 +110,7 @@
 private:
   Face& m_face;
   Scheduler m_scheduler;
-  const PendingInterestId* m_interestId;
+  PendingInterestHandle m_pendingInterest;
   DataCallback m_onData;
   FailureCallback m_onNack;
   FailureCallback m_onTimeout;