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When the "Protected content" permission decision is different from the
default value, "Protected content" will show up in the PageInfo.

See screenshots at:
https://photos.app.goo.gl/Rmd5S75gTUNU7vZVA

Similar change on Android will be done in a separate CL.

Bug: 593210
Test: Manually tested. See screenshots linked above.
Change-Id: I4200ec867f143edc67a1215dc9dc755575c89a04
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900113Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Auto-Submit: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713560}