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Reduce copy-paste in concierge_client.cc

This CL reduces the code duplication for calling DBus methods in
concierge_client.cc.

Change-Id: Id5a9ca03f7faad049460f047c6f1ca63c2ea847f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1778442Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692976}