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Per discussions with product and legal, we want to continue to use a
single metrics reporting / crash upload consent on Chrome OS, for both
the OS and the lacros browser. Notes at go/lacros-crash-consent

This CL connects the browser settings toggle for metrics reporting
to the canonical OS metrics reporting pref over mojo. See design doc
at go/lacros-metrics-consent

Bug: 1148604
Test: added to unit_tests and lacros_chrome_browsertests
Change-Id: I38b20ba6d92c6e6b46be297a2120a964023cd195
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2582642Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835757}