impl/prod: Make AEContext private.

impl/prod/mail.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 prod
 
 import (
         gae_mail "github.com/luci/gae/service/mail"
         "golang.org/x/net/context"
         "google.golang.org/appengine/mail"
 )
 
 // useMail adds a mail service implementation to context, accessible
 // by "github.com/luci/gae/service/mail".Raw(c) or the exported mail service
 // methods.
 func useMail(c context.Context) context.Context {
         return gae_mail.SetFactory(c, func(ci context.Context) gae_mail.RawInterface {
-                return mailImpl{AEContext(ci)}
+                return mailImpl{getAEContext(ci)}
         })
 }
 
 type mailImpl struct {
         aeCtx context.Context
 }
 
 func (m mailImpl) Send(msg *gae_mail.Message) error {
         return mail.Send(m.aeCtx, msg.ToSDKMessage())
 }
 
 func (m mailImpl) SendToAdmins(msg *gae_mail.Message) error {
         return mail.Send(m.aeCtx, msg.ToSDKMessage())
 }
 
 func (m mailImpl) GetTestable() gae_mail.Testable { return nil }