Don't filter "Stop" error in raw interface.

impl/memory/gkvlite_iter.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package memory
 
 import (
         "bytes"
         "sync"
 
-        "github.com/luci/gae/service/datastore"
         "github.com/luci/gae/service/datastore/serialize"
         "github.com/luci/gkvlite"
 )
 
 type iterDefinition struct {
         // The collection to iterate over
         c *memCollection
 
         // The prefix to always assert for every row. A nil prefix matches every row.
         prefix []byte
@@ skipping 71 matching lines @@
                         }
                 }
                 if stop {
                         return nil
                 }
                 if restart {
                         continue
                 }
 
                 if err := cb(suffix); err != nil {
-                        if err == datastore.Stop {
-                                return nil
-                        }
                         return err
                 }
                 suffix = nil
                 skip = -1
         }
 }
 
 type cmd struct {
         targ []byte
         cb   func(*gkvlite.Item)
@@ skipping 95 matching lines @@
         t.ch <- &cmd{targ, func(i *gkvlite.Item) {
                 defer close(waiter)
 
                 if i == nil {
                         t.stop()
                 }
                 cb(i)
         }}
         <-waiter
 }