Sync web-platform-tests PR 20538 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/20538
Details from upstream follow.

Yifan Luo <lyf@google.com> wrote:

Fix appcache tests.

Adjust the wpt tests for application cache according to https://chromium-review.googlesource.com/c/chromium/src/+/1926478/20/third_party/blink/web_tests/external/wpt/fetch/metadata/appcache.tentative.https.sub.html#24.

Bug: 1024198
Change-Id: I8bf6d94fbd12e5dd5ef65aea8a317a4694057c2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1938908
Reviewed-by: Mike West \<mkwst@chromium.org>
Reviewed-by: Marijn Kruisselbrink \<mek@chromium.org>
Commit-Queue: Yifan Luo \<lyf@google.com>
Cr-Commit-Position: refs/heads/master@{#719936}

CI Results

Ran 13 Firefox configurations based on mozilla-central, and Firefox, Chrome, and Safari on GitHub CI

Total 1 tests and 9 subtests

Status Summary

Firefox

OK : 1
PASS: 1
FAIL: 4

Chrome

OK : 1
PASS: 9

Safari

OK : 1
FAIL: 1

Links

Gecko CI (Treeherder)
GitHub PR Head
GitHub PR Base

Details

New Tests That Don't Pass

/fetch/metadata/appcache.tentative.https.sub.html
Appcache!: FAIL (Chrome: PASS, Safari: FAIL)
Appcache manifest: sec-fetch-mode: FAIL (Chrome: PASS)
Appcache manifest: sec-fetch-site: FAIL (Chrome: PASS)
Appcache manifest: sec-fetch-dest: FAIL (Chrome: PASS)

https://hg.mozilla.org/mozilla-central/rev/c59980aa889b
https://hg.mozilla.org/mozilla-central/rev/dbeb0e6953cb