Change gae to apache 2 license.

service/datastore/meta/eg.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 meta
 
 import (
         "github.com/luci/gae/service/datastore"
         "golang.org/x/net/context"
 )
 
 // EntityGroupMeta is the model corresponding to the __entity_group__ model in
 // appengine. You shouldn't need to use this struct directly, but instead should
@@ skipping 14 matching lines @@
         egm := &EntityGroupMeta{Parent: key.Root()}
         err := ds.Get(egm)
         ret := egm.Version
         if err == datastore.ErrNoSuchEntity {
                 // this is OK for callers. The version of the entity group is effectively 0
                 // in this case.
                 err = nil
         }
         return ret, err
 }