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Chrome security is trending away from showing the URL scheme, to an
icon-based representation. To support that, we should return to showing
the info icon if there is no other state (either secure or dangerous).

BUG=778411
R=bshe

Change-Id: Ic6ec0af9ff628bcacab55484a7e584339e59528f
Reviewed-on: https://chromium-review.googlesource.com/773119Reviewed-by: Biao She <bshe@chromium.org>
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517146}