Refactor SignalStrategy so that it can be reused for multiple connections.

remoting/jingle_glue/iq_sender.cc

Index: remoting/jingle_glue/iq_sender.cc
diff --git a/remoting/jingle_glue/iq_sender.cc b/remoting/jingle_glue/iq_sender.cc
index e0e1e5b1fedada9227ffe5687179c5230596b839..d22e0f80ad9b7eeb5212584c22243c3cc63efa16 100644
--- a/remoting/jingle_glue/iq_sender.cc
+++ b/remoting/jingle_glue/iq_sender.cc
@@ -66,7 +66,10 @@ void IqSender::RemoveRequest(IqRequest* request) {
   }
 }
 
-bool IqSender::OnIncomingStanza(const buzz::XmlElement* stanza) {
+void IqSender::OnSignalStrategyStateChange(SignalStrategy::State state) {
+}
+
+bool IqSender::OnSignalStrategyIncomingStanza(const buzz::XmlElement* stanza) {
   if (stanza->Name() != buzz::QN_IQ) {
     LOG(WARNING) << "Received unexpected non-IQ packet " << stanza->Str();
     return false;