Implement HTMLOptionElement named constructor
This change implements `Option` named constructor for `HTMLOptionElement`.
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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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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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let document.createElement[NS] accept a string for options
The string actually does nothing, but spec and WPT don't want it to do anything. https://dom.spec.whatwg.org/#dom-document-createelement only cares about the options value when it's a dictionary, and the WPT test on the string case is just that it isn't throwing an exception.
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apply is: to Document.createElement even when name isn't registered yet
The "is" option to Document.createElement should be respected even when the name hasn't been registered yet, in which case the name gets looked up again at the time the element should be upgraded. This change does that.
I'm now seeing a few test timeouts that aren't in the metadata, but I suspect they're slowness on my local configuration and not actual breakage.
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Remove obsolete HasInstance behavior per heycam/webidl #356
This turns one WPT test from fail to pass and it leaves Servo with a little less platform object special-case code to worry about.
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Autocomputed content-type header now reaches net request
The spec expects that for a DOM Request r, r.headers and r.request can actually refer to the same header list in RAM, with changes to one affecting the other. This is mostly unobservable, but it happens to come up at the point in the Request constructor that auto-infers a content type from the body, so now after inferring the content type it injects it into both header lists instead of one.
Remaining test failures are due to the way Hyper crates normalize semicolons in MIME types, and an actually separate problem about content-lengths that I haven't sniffed out yet.
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Restructure Blob, structured serialization
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FIX#24052 and also address the "cloning" half of FIX#23917
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Removed createEvent cases, removed now-unused new_uninitializeds
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document.createEvent was creating some event types WHATWG now says shouldn't be created that way. This was the only caller of a few new_uninitialized methods, so those are removed too.
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