Do not show the previews icon on broken HTTPS pages

This was in the original UX spec and I missed it :(
It caused the bug below since the VerboseStatusView does respect the
security level, but this did not.

On a side note, I've filed a bug for M74 to not allow previews on
broken HTTPS pages in the first place.

Bug: 929412
Change-Id: If9ad72584de62e6a51e4a6e676255d5e394ba9c3
Reviewed-on: https://chromium-review.googlesource.com/c/1474382
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632653}
1 file changed