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This CL ignores private registries when computing the simplified
domain, i.e. registrable domain. For example, "foo.example.com" will
be simplified to "example.com", and "foo.blogspot.com" will be
simplified to "blogspot.com". (Note that as of
https://chromium-review.googlesource.com/c/chromium/src/+/2337761, the
simplified domain logic only applies in unusual cases; most of the
time, we show the full hostname).

The reason for ignoring private registries is that we don't want to
create negative incentives for malicious websites to add themselves as
private registries to the Public Suffix List.

This policy isn't perfect, but we think it best balances the security
benefit of eliding malicious subdomains while minimally impacting
benign websites that use subdomains.

Bug: 1106962
Change-Id: Ifb75a510707c1dcac0825f899625069656838932
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2356936Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798230}