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The PolicyContainer will serve as a container for security policies
(such as Content-Security-Policy, Referrer Policy, COOP, COEP) that
are applied to a document and have similar lifecycles.

This is the first of a series of CLs implementing the
PolicyContainer. We define a PolicyContainer class in content and
attach a PolicyContainer to each RenderFrameHostImpl.

Change-Id: Ief6d3b342c3f458aa21b53bee265732e65f3bd1e
Bug: 1130587
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2418316
Commit-Queue: Antonio Sartori <antoniosartori@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Pâris Meuleman <pmeuleman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815505}