helper+model: Fix helpers to work with NFD/ndn-cxx 0.4+

Change-Id: I7ed2893acbda1458383603c0e3c154d3e841405e
Refs: #3560
diff --git a/helper/ndn-strategy-choice-helper.cpp b/helper/ndn-strategy-choice-helper.cpp
index 53ba544..6958fce 100644
--- a/helper/ndn-strategy-choice-helper.cpp
+++ b/helper/ndn-strategy-choice-helper.cpp
@@ -40,10 +40,9 @@
 
   shared_ptr<Interest> command(make_shared<Interest>(commandName));
   StackHelper::getKeyChain().sign(*command);
-  Ptr<L3Protocol> L3protocol = node->GetObject<L3Protocol>();
-  auto strategyChoiceManager = L3protocol->getStrategyChoiceManager();
-  strategyChoiceManager->onStrategyChoiceRequest(*command);
-  NS_LOG_DEBUG("Forwarding strategy installed in node " << node->GetId());
+
+  Ptr<L3Protocol> l3protocol = node->GetObject<L3Protocol>();
+  l3protocol->injectInterest(*command);
 }
 
 void