src: decouple classes from Nlsr object

refs: #1952, #2803, #3960, #4288

Change-Id: Ibe3ac3820f11e8107ee4b13e510d53c27467a6cb
diff --git a/src/route/map.hpp b/src/route/map.hpp
index 01801be..b4aa396 100644
--- a/src/route/map.hpp
+++ b/src/route/map.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2014-2018,  The University of Memphis,
+ * Copyright (c) 2014-2019,  The University of Memphis,
  *                           Regents of the University of California
  *
  * This file is part of NLSR (Named-data Link State Routing).
@@ -54,8 +54,6 @@
 
 } // namespace detail
 
-class Nlsr;
-
 class Map
 {
 public: