修复编译不过的问题

lib/rpc.dart

@@ -74,9 +74,6 @@ class JsonRpcProxy {
 	LoginService get login =>
 	findService(() => new LoginService(currentHostAddress));
 
-	NotificationService get notification =>
-	findService(() => new NotificationService(currentHostAddress));
-
 	OrganizationService get organization =>
 	findService(() => new OrganizationService(currentHostAddress));