cleanup: remove unused symbols (#2581)

examples/features/metadata/server/main.go

@@ -40,7 +40,6 @@ var port = flag.Int("port", 50051, "the port to serve on")
 
 const (
 	timestampFormat = time.StampNano
-	smallDuration   = time.Second
 	streamingCount  = 10
 )
 

examples/features/name_resolving/server/main.go

@@ -50,9 +50,6 @@ func (s *ecServer) BidirectionalStreamingEcho(ecpb.Echo_BidirectionalStreamingEc
 	return status.Errorf(codes.Unimplemented, "not implemented")
 }
 
-func startServer(addr string) {
-}
-
 func main() {
 	lis, err := net.Listen("tcp", addr)
 	if err != nil {