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

remoting/jingle_glue/iq_sender.h

Index: remoting/jingle_glue/iq_sender.h
diff --git a/remoting/jingle_glue/iq_sender.h b/remoting/jingle_glue/iq_sender.h
index 2696b80432f641a8f7acdbef69ea419899d88549..68871a48b1abc22dc9224fa5da8b0552ba96d5c5 100644
--- a/remoting/jingle_glue/iq_sender.h
+++ b/remoting/jingle_glue/iq_sender.h
@@ -48,7 +48,10 @@ class IqSender : public SignalStrategy::Listener {
                     const ReplyCallback& callback) WARN_UNUSED_RESULT;
 
   // SignalStrategy::Listener implementation.
-  virtual bool OnIncomingStanza(const buzz::XmlElement* stanza) OVERRIDE;
+  virtual void OnSignalStrategyStateChange(
+      SignalStrategy::State state) OVERRIDE;
+  virtual bool OnSignalStrategyIncomingStanza(
+      const buzz::XmlElement* stanza) OVERRIDE;
 
  private:
   typedef std::map<std::string, IqRequest*> IqRequestMap;