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With an upcoming change to Feature/Permissions Policy, the header
alone will no longer be sufficient to delegate permissions to use
powerful features in subframes. The iframe allow attribute must
be used in conjunction with it. The header can still be used to
block delegation.

This change updates the permission delegation unit tests to use the
allow attribute when delegating permissions to cross-origin frames.

Bug: 1095641
Change-Id: I47d6ab6ed04fdc75b2a7f51581f7213f6411cf89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424635Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812174}