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Fixes issues with UTCExploded() on certain 32-bit systems, where Time's
in the near and distant future would result in exploded calendar fields
in "random years past." This change solves the Y2038 problem for those
systems.

Hardens the UTC/LocalExploded() API, to guarantee all platforms will
explode from the years 1601 to 30828 (at least), and clarifies how
callers should check for a valid conversion. For platforms whose
standard libraries are insufficient, the icu::Calendar implementation is
used to provide the needed functionality.

Fixes/Simplification to ensure base::Time::ToRoundedDownMillis...() will
never do math that overflows int64_t's. Minor other tweaks in touched
files.

Fixes to a couple of unit tests in net/der and net/cert/internal.

Bug: 1104442
Change-Id: I5f0e45879b8ee18cc7c253fa4a204443fdc27ebf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2317864
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Matt Mueller <mattm@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802050}