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This is also enforced with a renderer kill in case the browser receives
a non-HTTP navigation request.

Bug: 962500
Change-Id: Id7c122ba80ef1cc00620d07d5ecdb1f268b04d79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1615499
Commit-Queue: Lucas Gadani <lfg@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660918}