chaps: Reinstate org.chromium.Chaps.service file

This file is needed for the Linux build of Chaps.

This reverts commit 6e8077189cbb ("Remove org.chromium.Chaps.service")

BUG=None
TEST=Chaps unit tests (with ASAN) plus PKCS11 tests

Change-Id: I900df09cdb3b89846ff51ea310ef8b9af3d9404a
Reviewed-on: https://chromium-review.googlesource.com/221932
Reviewed-by: Darren Krahn <dkrahn@chromium.org>
Commit-Queue: David Drysdale <drysdale@google.com>
Tested-by: David Drysdale <drysdale@google.com>
diff --git a/chaps/org.chromium.Chaps.service b/chaps/org.chromium.Chaps.service
new file mode 100644
index 0000000..10cf47e
--- /dev/null
+++ b/chaps/org.chromium.Chaps.service
@@ -0,0 +1,4 @@
+[D-BUS Service]
+Name=org.chromium.Chaps
+Exec=/usr/sbin/chapsd
+User=root