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

logdog/common/storage/bigtable/bigtable.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package bigtable
 
 import (
         "fmt"
         "time"
 
         "cloud.google.com/go/bigtable"
         "golang.org/x/net/context"
         "google.golang.org/grpc/codes"
 
-        "github.com/luci/luci-go/common/errors"
+        "github.com/luci/luci-go/common/retry"
         "github.com/luci/luci-go/grpc/grpcutil"
         "github.com/luci/luci-go/logdog/common/storage"
 )
 
 const (
         logColumnFamily = "log"
 
         // The data column stores raw low row data (RecordIO blob).
         logColumn  = "data"
         logColName = logColumnFamily + ":" + logColumn
@@ skipping 164 matching lines @@
                 return nil
         }
 
         // For Apply, assume that anything other than InvalidArgument (bad data) is
         // transient. We exempt InvalidArgument because our data construction is
         // deterministic, and so this request can never succeed.
         switch code := grpcutil.Code(err); code {
         case codes.InvalidArgument:
                 return err
         default:
-                return errors.WrapTransient(err)
+                return retry.Tag.Apply(err)
         }
 }