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Replaces kInsecure with kInsecureBroken so that styling for
non-secure connections can later be downgraded from kNeutral
to kInsecure.

This is a follow-up to crrev.com/c/1874787 (protocol change)
and crrev.com/c/1880092 (frontend change).

Bug: 1008218
Change-Id: Iacfb79b94c1c7622749e95cd204d598b6e3c81b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879498Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Daniel Rubery <drubery@chromium.org>
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709498}