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Although it seems unlikely that the clock would ever return a positive
or negative infinity value in real life, we need to help the fuzzer get
over this bump.

Under the hood, TimeBase::operator- was being invoked when we computed
|backoff_duration = absolute_release_time - time_now|, and this
operation was overflowing the int64_t. This CL converts the values to
TimeDelta before subtracting. As a result, the subtraction now uses
TimeDelta::operator-, ensuring the integer overflow does not occur via
saturating math.

Bug: 1083616
Change-Id: I24481920a4dfc4b2f8bd57b106190879656ddc28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320416Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Commit-Queue: Dan McArdle <dmcardle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792030}