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With the advent of HTTPS Server Previews, we need to remove the "not
HTTPS" verbage from these strings. See the bug for more info and where
I got the strings.

Bug: 889684
Change-Id: I6d3669f30415396a68b81e316a9cc3435fc33f37
Reviewed-on: https://chromium-review.googlesource.com/1255682Reviewed-by: Doug Arnett <dougarnett@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595726}