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

remoting/jingle_glue/fake_signal_strategy.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_JINGLE_GLUE_FAKE_SIGNAL_STRATEGY_H_
 #define REMOTING_JINGLE_GLUE_FAKE_SIGNAL_STRATEGY_H_
 
 #include <queue>
 #include <string>
 
+#include "base/observer_list.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "remoting/jingle_glue/iq_sender.h"
 #include "remoting/jingle_glue/signal_strategy.h"
 
 namespace remoting {
 
 class FakeSignalStrategy : public SignalStrategy,
                            public base::NonThreadSafe {
  public:
   static void Connect(FakeSignalStrategy* peer1, FakeSignalStrategy* peer2);
 
   FakeSignalStrategy(const std::string& jid);
   virtual ~FakeSignalStrategy();
 
   // SignalStrategy interface.
-  virtual void Init(StatusObserver* observer) OVERRIDE;
-  virtual void Close() OVERRIDE;
+  virtual void Connect() OVERRIDE;
+  virtual void Disconnect() OVERRIDE;
+  virtual State GetState() const OVERRIDE;
+  virtual std::string GetLocalJid() const OVERRIDE;
   virtual void AddListener(Listener* listener) OVERRIDE;
   virtual void RemoveListener(Listener* listener) OVERRIDE;
   virtual bool SendStanza(buzz::XmlElement* stanza) OVERRIDE;
   virtual std::string GetNextId() OVERRIDE;
 
  private:
   // Called by the |peer_|. Takes ownership of |stanza|.
   void OnIncomingMessage(buzz::XmlElement* stanza);
 
   void DeliverIncomingMessages();
 
   std::string jid_;
   FakeSignalStrategy* peer_;
-  std::vector<Listener*> listeners_;
+  ObserverList<Listener, true> listeners_;
 
   int last_id_;
 
   std::queue<buzz::XmlElement*> pending_messages_;
 
   base::WeakPtrFactory<FakeSignalStrategy> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeSignalStrategy);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_JINGLE_GLUE_FAKE_SIGNAL_STRATEGY_H_