face: replace EventEmitter usage with Signal

refs #2300

Change-Id: I17d0d65d2c474b17dd9f23f271a6144b0b4fbc07
diff --git a/daemon/face/websocket-face.cpp b/daemon/face/websocket-face.cpp
index abd8b3c..ad344d1 100644
--- a/daemon/face/websocket-face.cpp
+++ b/daemon/face/websocket-face.cpp
@@ -47,7 +47,7 @@
   if (m_closed)
     return;
 
-  this->onSendInterest(interest);
+  this->emitSignal(onSendInterest, interest);
   const Block& payload = interest.wireEncode();
   this->getMutableCounters().getNOutBytes() += payload.size();
 
@@ -67,7 +67,7 @@
   if (m_closed)
     return;
 
-  this->onSendData(data);
+  this->emitSignal(onSendData, data);
   const Block& payload = data.wireEncode();
   this->getMutableCounters().getNOutBytes() += payload.size();