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This change replaces network::IsUrlPotentiallyTrustworthy with
network::IsOriginPotentiallyTrustworthy in the Insecure Input Tab
Helper. The difference is that "potentially trustworthy origin" does
not include "data:" and "about:" schemes [1].

[1] https://w3c.github.io/webappsec-secure-contexts/#potentially-trustworthy-url

Bug: 1119740, 1153336
Change-Id: Ib817eee3a8460b1f99669b6dc77c92f0e7ed2743
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580067
Commit-Queue: Frédéric Wang <fwang@igalia.com>
Reviewed-by: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835574}