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This special-cases the LEGACY_TLS status in Page Info on Desktop so that
it doesn't cause the certificate to be marked as "Invalid". This also
updates the identity status logic to always check and mark legacy TLS
pages so that we use the more specific security summary text (which
refers to outdated security configurations specifically) for sites that
use legacy TLS.

Bug: 1056376
Change-Id: I399b79832ba6ffd0b82f8906bc09afe0576c198b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076517Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Commit-Queue: Christopher Thompson <cthomp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744883}