Override summary string for non-cryptographic secure origins

Screenshot: https://drive.google.com/file/d/1_rgMIl75jEqp0kDij4y9OrKAaAYATR1X/view?usp=sharing

Bug: 543864
Change-Id: Ic656621db5485da3cd8a92917780d4ee89d6cd73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1512181
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639724}
6 files changed