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This CL is fixing a shutdown hangs caused by a condition
variable wait(...).

The code is scheduling a background task that will never be
executed which is causing a deadlock.
see: https://bugs.chromium.org/p/chromium/issues/detail?id=1086185#c24

Bug: 1086185
Change-Id: Ie401cd284d6af29f6c8c5da8ed085c72a81a0487
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485635Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818692}