cros_healthd: change to new interface

Update Chrome's copy of cros_healthd.mojom to stay in
sync with Chrome OS's copy, and change cros_healthd's
ServiceConnection to work with the new mojo interface.

Bug: chromium:1040161
Test: chromeos_unittests --gtest_filter=CrosHealthdServiceConnectionTest.*
Change-Id: If3b0fba44bcea71e8221dd86f9a9ad8f772b05e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992586
Commit-Queue: Paul Moy <pmoy@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#730974}
9 files changed