Syncing wpt PR 35707 found new untriaged test failures in CI

Tests Affected

New Tests That Don't Pass

• /preload/prefetch-accept.html [wpt.fyi]
  • Document prefetch should send the exact Accept header as navigation: FAIL (Chrome: PASS, Safari: TIMEOUT)
• /preload/prefetch-document.html [wpt.fyi]
  • same origin document prefetch without 'as' should be consumed: FAIL (Chrome: PASS, Safari: TIMEOUT)
  • same-site different-origin document prefetch without 'as' should be consumed: FAIL (Chrome: PASS, Safari: NOTRUN)
  • Document prefetch should send the exact Accept header as navigation: FAIL (Chrome: PASS, Safari: NOTRUN)
• /preload/prefetch-events.html [wpt.fyi]
  • Prefetch should fire the load event: FAIL (Chrome: PASS, Safari: FAIL)
  • Prefetch should fire the error event for network errors: FAIL (Chrome: PASS, Safari: FAIL)

CI Results

Gecko CI (Treeherder)
GitHub PR Head

Notes

These updates will be on mozilla-central once bug 1810933 lands.

Note: this bug is for tracking fixing the issues and is not
owned by the wpt sync bot.

This bug is linked to the relevant tests by an annotation in
https://github.com/web-platform-tests/wpt-metadata. These annotations
can be edited using the wpt interop dashboard
https://jgraham.github.io/wptdash/

If this bug is split into multiple bugs, please also update the
annotations, otherwise we are unable to track which wpt issues are
already triaged. Resolving as duplicate or closing this issue should
be cause the bot to automatically update or remove the annotation.