Change gae to apache 2 license.

service/datastore/key.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 datastore
 
 import (
         "bytes"
         "encoding/base64"
         "encoding/json"
         "errors"
         "fmt"
         "strings"
@@ skipping 438 matching lines @@
         for _, t := range k.toks {
                 ret += int64(len(t.Kind))
                 if t.StringID != "" {
                         ret += int64(len(t.StringID))
                 } else {
                         ret += 8
                 }
         }
         return ret
 }