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

remoting/jingle_glue/jingle_signaling_connector.cc

Index: remoting/jingle_glue/jingle_signaling_connector.cc
diff --git a/remoting/jingle_glue/jingle_signaling_connector.cc b/remoting/jingle_glue/jingle_signaling_connector.cc
index 2cfe3da1c6efd7af1852bb5cd596c19f8158400f..913633af90c5427759fe177174c45640881dcd8a 100644
--- a/remoting/jingle_glue/jingle_signaling_connector.cc
+++ b/remoting/jingle_glue/jingle_signaling_connector.cc
@@ -48,7 +48,11 @@ JingleSignalingConnector::~JingleSignalingConnector() {
                                        pending_requests_.end());
 }
 
-bool JingleSignalingConnector::OnIncomingStanza(
+void JingleSignalingConnector::OnSignalStrategyStateChange(
+    SignalStrategy::State state) {
+}
+
+bool JingleSignalingConnector::OnSignalStrategyIncomingStanza(
     const buzz::XmlElement* stanza) {
   if (session_manager_->IsSessionMessage(stanza)) {
     session_manager_->OnIncomingMessage(stanza);