GitLab

Calculate |kBackoffPolicy| on first use at a local scope instead.
Because base::TimeDelta::InMilliseconds() and friends are not constexpr,
a global that calls them must do so during process startup.

Remove deprecated DISALLOW_IMPLICIT_CONSTRUCTORS() usage along the way.

Bug: 537099
Change-Id: If1680816bc18107f7b15e366e205b409c92bf0b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2430299Reviewed-by: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810860}