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This change moves the Restrictions struct (public in the declaration
of PpdProvider) into the PPD metadata parsing code. This is not the
change where we cut away the v2 PpdProvider, though, so we retain the
old struct definition as PpdProvider::LegacyRestrictions.

In addition, this change modifies the semantics of Restrictions;
metadata that can be restricted now always contains Restrictions
structs, but the struct's members (max and min milestones) are now
optional.

Bug: chromium:888189
Test: chromeos_unittests
Change-Id: I03a3825ec2150e8db93a2187d11285afcd44b07a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2393615
Commit-Queue: Kalvin Lee <kdlee@chromium.org>
Reviewed-by: Luum Habtemariam <luum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808603}