Simplify memory package interface.

go/src/infra/gae/libs/wrapper/memory/key_test.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"
         "fmt"
         "infra/gae/libs/wrapper"
@@ skipping 13 matching lines @@
         if !a.Equal(b) {
                 return fmt.Sprintf("Expected: %s\nActual:   %s", b.String(), a.String())
         }
         return ""
 }
 
 func TestKeyBinaryStuff(t *testing.T) {
         t.Parallel()
 
         Convey("Key binary encoding", t, func() {
-                c := Use(Enable(context.Background()))
+                c := Use(context.Background())
                 c, err := wrapper.GetGI(c).Namespace("bobspace")
                 So(err, ShouldBeNil)
                 ds := wrapper.GetDS(c)
 
                 k := ds.NewKey("Bunny", "", 10, ds.NewKey("Parent", "Cat", 0, nil))
                 So(k.Namespace(), ShouldEqual, "bobspace")
 
                 b := &bytes.Buffer{}
                 writeKey(b, withNS, k)
 
                 newk, err := readKey(b, withNS)
                 So(err, ShouldBeNil)
                 So(k.Namespace(), ShouldEqual, "bobspace")
                 So(newk, shouldEqualKey, k)
                 So(b.Bytes(), ShouldBeEmpty)
         })
 }