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With error page isolation, navigations that result in a chrome error
page (as opposed to HTTP errors such as 404) are isolated in their own
process.

This CL adds some validations at commit time to ensure that invariants
we expect are enforced by the browser. It only includes some of the
possible checks, as more investigations are needed to understand the
behavior of HTTP layer errors.

Bug: 866549
Change-Id: I8389629eb68213681983b37d1cfc945832e35ea7
Reviewed-on: https://chromium-review.googlesource.com/1160877
Commit-Queue: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580670}