Change gae to apache 2 license.

impl/memory/mail_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 memory
 
 import (
         net_mail "net/mail"
         "testing"
 
         mailS "github.com/luci/gae/service/mail"
         userS "github.com/luci/gae/service/user"
         . "github.com/luci/luci-go/common/testing/assertions"
@@ skipping 215 matching lines @@
                                         Body:    "I forgot",
                                         Headers: net_mail.Header{"x-spam-cool": []string{"value"}},
                                 }), ShouldErrLike, `disallowed header: x-spam-cool`)
 
                         })
 
                 })
 
         })
 }