login: Fix StopArcInstance

There was a stray dbus command in StopArcInstance that caused it to
crash.

BUG=b:24339743
TEST=StopArcInstance no longer crashes.

Change-Id: I1c918fa7bbabcb19e124a48cfdfd42ffbf1dfb5b
Reviewed-on: https://chromium-review.googlesource.com/311416
Commit-Ready: Luis Hector Chavez <lhchavez@google.com>
Tested-by: Luis Hector Chavez <lhchavez@google.com>
Reviewed-by: Dan Erat <derat@chromium.org>
1 file changed