Change gae to apache 2 license.

filter/txnBuf/race_test.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 (
         "sync"
         "testing"
 
         "github.com/luci/gae/impl/memory"
         "github.com/luci/gae/service/datastore"
         "golang.org/x/net/context"
@@ skipping 39 matching lines @@
 
                                 return nil
                         }, nil)
                         if err != nil {
                                 t.Fatal("bad outer RIT", err)
                         }
                 }()
         }
         wg.Wait()
 }