Change gae to apache 2 license.

filter/dscache/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 dscache
 
 import (
         "time"
 
         ds "github.com/luci/gae/service/datastore"
         "github.com/luci/gae/service/memcache"
         "github.com/luci/luci-go/common/errors"
         log "github.com/luci/luci-go/common/logging"
@@ skipping 121 matching lines @@
                 if err == nil {
                         err = txnState.apply(d.supportContext)
                 }
                 return err
         }, opts)
         if err == nil {
                 txnState.release(d.supportContext)
         }
         return err
 }