Fix a missed reference to service_stopper

BUG=chromium-os:38439
TEST=run locally

Change-Id: If6c158477cf63831a2f0da976d2f19b11b0fdfec
Reviewed-on: https://gerrit.chromium.org/gerrit/42826
Reviewed-by: Julius Werner <jwerner@chromium.org>
Commit-Queue: Mark Koudritsky <kamrik@chromium.org>
Tested-by: Mark Koudritsky <kamrik@chromium.org>
1 file changed