[errors] de-specialize Transient in favor of Tags.

tokenserver/appengine/impl/utils/bqlog/bqlog.go

Index: tokenserver/appengine/impl/utils/bqlog/bqlog.go
diff --git a/tokenserver/appengine/impl/utils/bqlog/bqlog.go b/tokenserver/appengine/impl/utils/bqlog/bqlog.go
index 0892b52db9378ec0e3bb71fb038a717767da0c85..63b7d41372c9e17726a913fc4cf352389e4bac42 100644
--- a/tokenserver/appengine/impl/utils/bqlog/bqlog.go
+++ b/tokenserver/appengine/impl/utils/bqlog/bqlog.go
@@ -578,7 +578,7 @@ func (f *asyncFlusher) upload(ctx context.Context, chunk chunk) (int, error) {
 		dt := clock.Since(ctx, startTime)
 		bigQueryLatency.Add(ctx, float64(dt.Nanoseconds()/1e6), f.TableRef, "insertAll", status)
 		if code >= 500 {
-			return errors.WrapTransient(err)
+			return retry.Tag.Apply(err)
 		}
 		return err
 	}, func(err error, wait time.Duration) {
@@ -589,7 +589,7 @@ func (f *asyncFlusher) upload(ctx context.Context, chunk chunk) (int, error) {
 	})
 	if err != nil {
 		logging.WithError(err).Errorf(ctx, "Failed to send data to BigQuery")
-		if !errors.IsTransient(err) && err != context.DeadlineExceeded {
+		if !retry.Tag.In(err) && err != context.DeadlineExceeded {
 			chunk.Done(ctx)
 		}
 		return 0, err