changes to use dispose

MediaBrowser.Controller/Session/ISessionController.cs

@@ -33,12 +33,5 @@ namespace MediaBrowser.Controller.Session
         /// <param name="cancellationToken">CancellationToken for operation.</param>
         /// <returns>A task.</returns>
         Task SendMessage<T>(SessionMessageType name, Guid messageId, T data, CancellationToken cancellationToken);
-
-        /// <summary>
-        /// Gracefully closes all web sockets.
-        /// </summary>
-        /// <param name="cancellationToken">The cancellation token.</param>
-        /// <returns>A task.</returns>
-        Task CloseAllWebSockets(CancellationToken cancellationToken);
     }
 }