Test that cross-origin subframes can't set automatic beacon data
Cross-origin subframes are allowed to send automatic beacons, but they
are not allowed to set the data that will be sent out. This CL adds a
WPT to confirm that behavior.
Change-Id: I490eb5aa7d2a75cc8f6372382d311acbb173ee6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5783504
Reviewed-by: Andrew Verge averge@chromium.org
Commit-Queue: Liam Brady lbrady@google.com
Cr-Commit-Position: refs/heads/main@{#1343773}