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Currently the argument is unused but it should be used.

BUG=none
TEST=Stop an Upstart job with nonempty environment.

Change-Id: I5b6485a79a357cb900b3672248d695a376249084
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526662Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Commit-Queue: Youkichi Hosoi <youkichihosoi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825910}