Make audio thread hang checker less chatty.
Make audio thread hang checker less chatty.

Reduces the update frequency from 10 / minute to 5 / minute and
disables task posting during suspend.  Also removes some useless
debug alias code which wasn't working in most crash reports.

BUG=485272
TEST=suspend / resume cancels and restarts tasks correctly.

Review URL: https://codereview.chromium.org/1205693004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#336254}

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