removed USER_ID_CHANGED event

modules/xmpp/ChatRoom.js

         }
     }
 
-    if(!member.isFocus)
-        this.eventEmitter.emit(XMPPEvents.USER_ID_CHANGED, from, member.id);
-
     // Trigger status message update
     if (member.status) {
         this.eventEmitter.emit(XMPPEvents.PRESENCE_STATUS, from, member.status);

service/xmpp/XMPPEvents.js

     CALL_INCOMING: "xmpp.callincoming.jingle",
     // Designates an event indicating that we were kicked from the XMPP MUC.
     KICKED: "xmpp.kicked",
-    // Designates an event indicating that the userID for a specific JID has
-    // changed.
-    // Note: currently this event fires every time we receive presence from
-    // someone (regardless of whether or not the "userID" changed).
-    USER_ID_CHANGED: "xmpp.user_id_changed",
     // Designates an event indicating that we have joined the XMPP MUC.
     MUC_JOINED: "xmpp.muc_joined",
     // Designates an event indicating that a participant joined the XMPP MUC.