Change gae to apache 2 license.

impl/memory/mail_static_lists.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 (
         "github.com/luci/luci-go/common/stringset"
 )
 
 // all of these constants were imported on Mon Dec 14 18:18:00 PST 2015 from
 // https://cloud.google.com/appengine/docs/go/mail/
 
@@ skipping 136 matching lines @@
         "tif":  "image/tiff",
         "tiff": "image/tiff",
         "txt":  "text/plain",
         "vcf":  "text/x-vcard",
         "wav":  "audio/x-wav",
         "wbmp": "image/vnd.wap.wbmp",
         "xls":  "application/vnd.ms-excel",
         "xlsx": "application/vnd.ms-excel",
         "zip":  "application/zip",
 }