Thanks to great work by Outreachy intern Ahilya Sinha (:Cactusmachete)
[1], the in-tree wpt MANIFEST.json files are no longer used and will
soon be removed.
Invoking `mach wpt` will now cause a recent wpt manifest to be
downloaded from Taskcluster into the objdir (if not already present) and
updated to match the source tree. Running `mach wpt-manifest-update`
manually should no longer be necessary. Hopefully this fixes the many
issues caused by having this file under source control.
The tradeoff for auto-updating the manifest is an corresponding delay in
startup for wpt tests. In order to reduce this as much as possible,
there is ongoing work to speed up manifest updates [2].
If you notice regressions from this change, please file a bug in the
Testing::web-platform-tests component and needinfo me.
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1473915
[2] https://github.com/web-platform-tests/wpt/pull/12553
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