table: don't use shared_ptr in Measurements

refs #3164

Change-Id: I7705d00ac155b15b5db69809610b68e96360a0ae
diff --git a/daemon/table/measurements-entry.hpp b/daemon/table/measurements-entry.hpp
index 0c9bc48..8eb40ff 100644
--- a/daemon/table/measurements-entry.hpp
+++ b/daemon/table/measurements-entry.hpp
@@ -38,12 +38,11 @@
 class Entry;
 } // namespace name_tree
 
-class Measurements;
-
 namespace measurements {
 
-/** \class Entry
- *  \brief represents a Measurements entry
+class Measurements;
+
+/** \brief represents a Measurements entry
  */
 class Entry : public StrategyInfoHost, noncopyable
 {
@@ -64,7 +63,7 @@
 
   friend class nfd::NameTree;
   friend class nfd::name_tree::Entry;
-  friend class nfd::Measurements;
+  friend class Measurements;
 };
 
 inline const Name&