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The current origin policy interstitial uses the all-red super danger
interstitials style, and the text messages indicate an imemdiate security
threat (which could be true, but it might also be a simple mis-configuration).
This changes this to an SSL-error-like interstitial design, and a more neutral
language.

Bug: 971598, 751996
Change-Id: I31dba2ae7646eb1e2ee747ab93c9854516ffeddb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1795604Reviewed-by: Carlos IL <carlosil@chromium.org>
Commit-Queue: Daniel Vogelheim <vogelheim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695591}