Allow --force-uninstall for SxS Chrome and disallow --self-destruct.
Allow --force-uninstall for SxS Chrome and disallow --self-destruct.

--self-destruct does not make sense for SxS since SxS cannot be
installed at system-level. --force-uninstall is useful for debugging and
testing, so there is no reason not to support it for SxS.

BUG=456602
R=gab@chromium.org

Review URL: https://codereview.chromium.org/928713003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#316645}

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