Revert "Cross-origin support for window.fence.reportEvent()."

[chromium-wpt-export-bot]

This reverts commit 280fe80c08b919b9cb7ba8228b1b0323ce5bceea.

Reason for revert: Consistent failures: blink_wpt_tests on *

Example:
virtual/fenced-frame-mparch/external/wpt/fenced-frame/fence-report-event-cross-origin-urn-iframe.https.html

Regression ranges: chromium/src: 1282145 - 1282166

Bug: crbug.com/332755365

Original change's description:

Cross-origin support for window.fence.reportEvent().

Third-party ad serving (3PAS) lets advertisers manage ads across
different bidding platforms. However, the event-level reporting API
(reportEvent()) currently prevents direct reporting from documents that
are cross-origin to the root ad frame's fenced frame config's mapped
URL, limiting this functionality for the 3PAS use case. This CL extends
the reportEvent() API to support this use case.

To allow cross-origin reporting while still preserving privacy, both the
ad frame and the 3PAS subframe must explicitly opt in. The ad frame opts
in using a new Allow-Cross-Origin-Event-Reporting response header,
while the 3PAS subframe opts in by calling reportEvent() with
crossOriginExposed=true. If both opt-ins are present, then the
reportEvent() call from the 3PAS document will succeed.

This CL adds histograms to track how many beacons are sent from
documents that are same-origin and cross-origin to the fenced frame
config's mapped url.

This CL also expands the fenced frame WPT system to support
content-initiated navigations of fenced frame contexts to cross-origin
URLs.

Change-Id: I4e895bec4cb77604e2017cfc67b496d59863a30b
Bug: 331844131
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5403108
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Ben Kelly <wanderview@chromium.org>
Reviewed-by: Dominic Farolino <dom@chromium.org>
Reviewed-by: Garrett Tanzer <gtanzer@chromium.org>
Commit-Queue: Liam Brady <lbrady@google.com>
Cr-Commit-Position: refs/heads/main@{#1282086}

Bug: 331844131
Change-Id: I2fa4be5108ded57fa3c7e6675031a52ddf39a574
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5422053
Reviewed-by: Solomon Kinard <solomonkinard@google.com>
Auto-Submit: Solomon Kinard <solomonkinard@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Solomon Kinard <solomonkinard@google.com>
Commit-Queue: Solomon Kinard <solomonkinard@google.com>
Cr-Commit-Position: refs/heads/main@{#1282260}

[wpt-pr-bot]

The review process for this patch is being conducted in the Chromium project.

[WeizhongX]

This is a revert and the original PR has been merged in #45385.

@jcscottiii @KyleJu can you help admin merge?