fw: pass const shared_ptr<pit::Entry>& to Strategy triggers

refs #3205

Change-Id: I8f227c57ee6733526f0569de81f20677210cafa4
diff --git a/daemon/fw/best-route-strategy.cpp b/daemon/fw/best-route-strategy.cpp
index b97afca..ac166f4 100644
--- a/daemon/fw/best-route-strategy.cpp
+++ b/daemon/fw/best-route-strategy.cpp
@@ -37,14 +37,9 @@
 {
 }
 
-BestRouteStrategy::~BestRouteStrategy()
-{
-}
-
 void
-BestRouteStrategy::afterReceiveInterest(const Face& inFace,
-                                        const Interest& interest,
-                                        shared_ptr<pit::Entry> pitEntry)
+BestRouteStrategy::afterReceiveInterest(const Face& inFace, const Interest& interest,
+                                        const shared_ptr<pit::Entry>& pitEntry)
 {
   if (hasPendingOutRecords(*pitEntry)) {
     // not a new Interest, don't forward