stiptime: don't actual print to stdout when converting to string.

R=stip@chromium.org,hinoka@chromium.org
BUG=

Change-Id: I52cf35351ad2ef77d4fb1e838f2633ea8e66608b
Reviewed-on: https://chromium-review.googlesource.com/356372
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
Cr-Mirrored-From: https://chromium.googlesource.com/infra/infra
Cr-Mirrored-Commit: c1a42292e482c5996e5ea7cef1a64e8caa921b25
1 file changed