Minor cleanup after moving a constant to system_api.

BUG=none
TEST=emerge mtpd

Change-Id: I76f9b66bfc0ba846e7ce137580e56a764420f10e
Reviewed-on: https://gerrit.chromium.org/gerrit/33837
Reviewed-by: Ben Chan <benchan@chromium.org>
Commit-Ready: Lei Zhang <thestig@chromium.org>
Tested-by: Lei Zhang <thestig@chromium.org>
3 files changed