Remove dependency on XMPP implementation in WebRTC

remoting/signaling/signal_strategy.h

 // Copyright 2014 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_SIGNALING_SIGNAL_STRATEGY_H_
 #define REMOTING_SIGNALING_SIGNAL_STRATEGY_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 16 matching lines @@
 
     // Connection is closed due to an error or because Disconnect()
     // was called.
     DISCONNECTED,
   };
 
   enum Error {
     OK,
     AUTHENTICATION_FAILED,
     NETWORK_ERROR,
+    PROTOCOL_ERROR,
   };
 
   // Callback interface for signaling event. Event handlers are not
   // allowed to destroy SignalStrategy, but may add or remove other
   // listeners.
   class Listener {
    public:
     virtual ~Listener() {}
 
     // Called after state of the connection has changed. If the state
@@ skipping 45 matching lines @@
   // request.
   virtual std::string GetNextId() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SignalStrategy);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_SIGNALING_SIGNAL_STRATEGY_H_