Implement CustomElementRegistry.upgrade
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An additional small change will be needed if whatwg/html#5126 lands, which will pass an infinite recursion test this is currently failing in custom-elements/upgrading.html (right now the test is asking for behavior that isn't in the spec).
The remaining test in custom-elements/custom-element-registry/upgrade.html is because it needs shadow DOM.
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Radio button grouping is now case-sensitive
Just catching up with a spec update, as explained in #25389
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Add `track_list` member to AudioTrack, VideoTrack, TextTrack structs
Add member to the track structs pointing at their associated tracklist
and update it when the track is added or removed from a tracklist.
r?@jdm
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Header values no longer have to be ASCII or UTF-8
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This passes some failed tests related to header validity when handling ByteStrings outside the printable ASCII range. A few failures remain because the HeaderValue class is stricter than WHATWG/WPT, disallowing various control-code bytes that the spec and tests expect to be allowed.
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Now using eq_ignore_case on WASM mimetype, per #25317
I have no idea how this would be tested.
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