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Add the CaptivePortal routine to the ServiceConnection.

BUG=chromium:956783
TEST=1) chromeos_unittests --gtest_filter=CrosHealthdServiceConnectionTest.*
2) unit_tests --gtest_filter=DeviceCommandRunRoutineJobTest*
3) Applied CaptivePortal changes and successfully ran the
CaptivePortal routine on a DUT (verified using cros-health-tool diag
--action=run_routine --routine=captive_portal).

Change-Id: I8eb98621bdfde9efc53357ba05f04affce614139
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2477523Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Paul Moy <pmoy@chromium.org>
Commit-Queue: Kartik Hegde <khegde@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824968}