Change gae to apache 2 license.

filter/txnBuf/ds.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 txnBuf
 
 import (
         "golang.org/x/net/context"
 
         ds "github.com/luci/gae/service/datastore"
 )
 
 type dsBuf struct {
         ds.RawInterface
 }
 
 var _ ds.RawInterface = (*dsBuf)(nil)
 
 func (d *dsBuf) RunInTransaction(f func(context.Context) error, opts *ds.TransactionOptions) error {
         return doRunInTransaction(d.RawInterface, f, opts)
 }
 
 func doRunInTransaction(base ds.RawInterface, f func(context.Context) error, opts *ds.TransactionOptions) error {
         return base.RunInTransaction(func(ctx context.Context) error {
                 return withTxnBuf(ctx, f, opts)
         }, opts)
 }