Make SetTransactionRetryCount actually work.

impl/memory/context.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 (
         "errors"
         "sync"
 
@@ skipping 151 matching lines @@
                 }
                 return nil
         }
 
         // From GAE docs for TransactionOptions: "If omitted, it defaults to 3."
         attempts := 3
         if o != nil && o.Attempts != 0 {
                 attempts = o.Attempts
         }
         for attempt := 0; attempt < attempts; attempt++ {
-                if err := loopBody(attempt >= d.txnFakeRetry); err != ds.ErrConcurrentTransaction {
+                if err := loopBody(attempt >= d.data.txnFakeRetry); err != ds.ErrConcurrentTransaction {
                         return err
                 }
         }
         return ds.ErrConcurrentTransaction
 }