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This patch updates the infobar to show both the top and embedded origins
if WebOTP is used in a cross-origin iframe. The UI remains the same if
the API is used in the top frame.

Note: the exact string to show to users is still under UI review.

Bug: 1136506
Change-Id: I4320545c306abeb3cd44987bf0d2ba2ed94b192e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643626
Commit-Queue: Yi Gu <yigu@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846312}