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The "Lacros-chrome is not supported" was printing 7 times in each
Chrome OS browser_tests test run. This confused some developers, who
thought their test failures might be caused by lacros. Since the flag
being off is the common case, don't log.

Bug: none
Change-Id: I38b46b0a0390d39fae5ca1f095c9131aa25692f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627714
Auto-Submit: James Cook <jamescook@chromium.org>
Commit-Queue: Jenny Zhang <jennyz@chromium.org>
Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843636}