Change gae to apache 2 license.

impl/prod/memcache.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.
+// 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 (
         "time"
 
         mc "github.com/luci/gae/service/memcache"
         "golang.org/x/net/context"
         "google.golang.org/appengine"
         "google.golang.org/appengine/memcache"
@@ skipping 144 matching lines @@
         return memcache.Flush(m.aeCtx)
 }
 
 func (m mcImpl) Stats() (*mc.Statistics, error) {
         stats, err := memcache.Stats(m.aeCtx)
         if err != nil {
                 return nil, err
         }
         return (*mc.Statistics)(stats), nil
 }