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Leaking it triggered some canary/dev build checks on Windows that ensure we don't leak handles. In this case, the leak is ok, but the simplest thing for now is to stop leaking it. A side-benefit is we ensure that Mojo message loops shut down correctly at process shutdown.

BUG=559238
R=sky@chromium.org

Review URL: https://codereview.chromium.org/1471123002 .

Cr-Commit-Position: refs/heads/master@{#361264}