core: use FaceUri from ndn-cxx

refs #2143

Change-Id: Ida06daf406f941a699c9f1013450951db3cd28e9
diff --git a/daemon/face/ethernet-face.hpp b/daemon/face/ethernet-face.hpp
index 7530648..8f44eab 100644
--- a/daemon/face/ethernet-face.hpp
+++ b/daemon/face/ethernet-face.hpp
@@ -28,6 +28,7 @@
 
 #include "config.hpp"
 #include "face.hpp"
+#include "core/network-interface.hpp"
 
 #ifndef HAVE_LIBPCAP
 #error "Cannot include this file when libpcap is not available"
@@ -39,8 +40,6 @@
 
 namespace nfd {
 
-class NetworkInterfaceInfo;
-
 /**
  * \brief Implementation of Face abstraction that uses raw
  *        Ethernet frames as underlying transport mechanism