common: remove NDN_CXX_DECL_FINAL/OVERRIDE macros; use C++11 keywords directly

Change-Id: I8a6bc25a17574093addb144e6cdcc21dd24bbce4
Refs: #3599
diff --git a/tests/unit-tests/mgmt/dispatcher.t.cpp b/tests/unit-tests/mgmt/dispatcher.t.cpp
index 5458be0..42c3717 100644
--- a/tests/unit-tests/mgmt/dispatcher.t.cpp
+++ b/tests/unit-tests/mgmt/dispatcher.t.cpp
@@ -64,13 +64,13 @@
   }
 
   virtual Block
-  wireEncode() const NDN_CXX_DECL_FINAL
+  wireEncode() const final
   {
     return Block(128);
   }
 
   virtual void
-  wireDecode(const Block& wire) NDN_CXX_DECL_FINAL
+  wireDecode(const Block& wire) final
   {
     if (wire.type() != 128)
       throw tlv::Error("Expecting TLV type 128");