system_api: D-Bus errors from login_manager moved to system_api

The errors to D-Bus calls returned by session manager need to be
visible on Chrome side. This CL adds those errors to system_api,
while other CL removes them from dbus_error_types.

BUG=chromium:689206
TEST=Unit tests pass.
CQ-DEPEND=CL:474806

Change-Id: Ic07ebf70c6bd2eb3b22140dc1fc27477144e6cf4
Reviewed-on: https://chromium-review.googlesource.com/474750
Commit-Ready: Igor <igorcov@chromium.org>
Tested-by: Igor <igorcov@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
1 file changed