Update the list to revision 2225db8d9f4a2a27ec697c883360632fa0c16261
(2018-05-23T23:26:06Z).

Change-Id: Iec14ad04e81b205eeafdb6c8f02caec29f8df7e4
Reviewed-on: https://go-review.googlesource.com/128255Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>