Change gae to apache 2 license.

filter/featureBreaker/mail.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 featureBreaker
 
 import (
         "github.com/luci/gae/service/mail"
         "golang.org/x/net/context"
 )
 
 type mailState struct {
         *state
@@ skipping 11 matching lines @@
         return m.run(func() error { return m.Interface.SendToAdmins(msg) })
 }
 
 // FilterMail installs a featureBreaker mail filter in the context.
 func FilterMail(c context.Context, defaultError error) (context.Context, FeatureBreaker) {
         state := newState(defaultError)
         return mail.AddFilters(c, func(ic context.Context, i mail.Interface) mail.Interface {
                 return &mailState{state, i}
         }), state
 }