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This change is a functional no-op.

Along the way, I took the opportunity to improve documentation on
PolicyContainerHost constructors that are called in this change.

Bug: chromium:1126856, chromium:1154729
Change-Id: I28a600c00fbcb107d9c2ed72dd6070bc05fb62ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600744
Commit-Queue: Titouan Rigoudy <titouan@chromium.org>
Auto-Submit: Titouan Rigoudy <titouan@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Antonio Sartori <antoniosartori@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845193}