Change gae to apache 2 license.

filter/dscache/ds_txn_state.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 (
         "sync"
 
         "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 63 matching lines @@
         defer s.Unlock()
 
         for i, li := range lockItems {
                 k := lockKeys[i]
                 if _, ok := s.toDelete[k]; !ok {
                         s.toLock = append(s.toLock, li)
                         s.toDelete[k] = struct{}{}
                 }
         }
 }