Change gae to apache 2 license.

service/datastore/errors.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 (
         "fmt"
         "reflect"
 
         "github.com/luci/gae"
         "google.golang.org/appengine/datastore"
 )
@@ skipping 16 matching lines @@
 type ErrFieldMismatch struct {
         StructType reflect.Type
         FieldName  string
         Reason     string
 }
 
 func (e *ErrFieldMismatch) Error() string {
         return fmt.Sprintf("gae: cannot load field %q into a %q: %s",
                 e.FieldName, e.StructType, e.Reason)
 }