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SerialWorker instances could leak when the original task runner is
shutting down and no longer accepting tasks. This is because of the
implementation of ~PostTaskAndReplyRelay, which attempts to destroy its
own instance by DeleteSoon, which is also not accepted by the task
runner. This behavior produces warnings in ASAN builds, for example when
an instance of DnsConfigServicePosix::HostsReader is destroyed in
services_unittests.NetworkContextTest.

BUG=879152

Change-Id: I48df8e3171975ff6f11fe0676e456f8e8b756ec9
Reviewed-on: https://chromium-review.googlesource.com/1193344Reviewed-by: Bence Béky <bnc@chromium.org>
Commit-Queue: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588499}