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Remove WilcoDtcSupportdClient from DBusThreadManager and use a feature
check to determine if initialization is required. Moving the files is
required to be able to access ::features::kWilcoDtc.

Bug: 1014062
Test: unit_tests --gtest_filter="WilcoDtcSupport*"
Test: on device with diagnostics_dpsl_demo_vm

Change-Id: Ia83b91495cfab32a05a9642a871a4cdd8b13392e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865156
Commit-Queue: Victor-Gabriel Savu <vsavu@google.com>
Reviewed-by: Oleh Lamzin <lamzin@google.com>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Polina Bondarenko <pbond@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707286}