runtime: restore nacl timens Deleted in cl/123700044. I am not sure whether I need to restore it, or delete rest of the uses...
runtime: restore nacl timens
Deleted in cl/123700044.
I am not sure whether I need to restore it,
or delete rest of the uses...

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://codereview.appspot.com/129580043

tv42/old-go,tv42/old-go,tv42/old-go,tv42/old-go,tv42/old-go,tv42/old-go,tv42/old-go