Import wpt@555c330701cd1b45deb08e0681c62792183e1df0

Using wpt-import in Chromium d634307.

Note to sheriffs: This CL imports external tests and adds
expectations for those tests; if this CL is large and causes
a few new failures, please fix the failures by adding new
lines to TestExpectations rather than reverting. See:
https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md

Directory owners for changes in this CL:
japhet@chromium.org:
  external/wpt/fetch
rego@igalia.com:
  external/wpt/css/selectors

NOAUTOREVERT=true

No-Export: true
Validate-Test-Flakiness: skip
Cq-Include-Trybots: luci.chromium.try:linux-wpt-identity-fyi-rel,linux-wpt-input-fyi-rel,linux-blink-rel
Change-Id: Ia410126d8ba487aa95de238c9398eab1dc6dc381
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4789087
Commit-Queue: Weizhong Xia <weizhong@google.com>
Reviewed-by: Weizhong Xia <weizhong@google.com>
Auto-Submit: WPT Autoroller <wpt-autoroller@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1184759}

third_party/blink/web_tests/TestExpectations

@@ -2726,6 +2726,8 @@ crbug.com/1359555 external/wpt/speculation-rules/prerender/workers.html [ Failur
 crbug.com/626703 external/wpt/css/css-fonts/parsing/font-variant-invalid.html [ Crash ]
 
 # ====== New tests from wpt-importer added here ======
+crbug.com/626703 external/wpt/css/selectors/selectors-4/lang-017.html [ Failure ]
+crbug.com/626703 external/wpt/css/selectors/selectors-4/lang-018.html [ Failure ]
 crbug.com/626703 external/wpt/css/css-backgrounds/border-image-repeat-round-003.html [ Failure ]
 crbug.com/626703 external/wpt/css/css-backgrounds/border-image-repeat-round-stretch-001.html [ Failure ]
 crbug.com/626703 external/wpt/css/css-backgrounds/border-image-repeat-stretch-round-001.html [ Failure ]