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This adds an exemption for legacy TLS errors from being fatal errors.
This also adds a browser test (to ensure the interstitial is always
bypassable) and a unittest (to ensure that legacy TLS errors aren't
marked as fatal).

Bug: 1047777
Change-Id: Ia50bff281d7c68f4f678e9b6209f7bc7aaa495f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033644Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Commit-Queue: Christopher Thompson <cthomp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737479}