Re: [fetch] Treat Last-Event-ID and Client-Hints headers as simple headers (#258)

> +<span title=concept-header-name>name</span> is one of
> +
> +<ul class=brief>
> +  <li>`<code title>Accept</code>`
> +  <li>`<code title>Accept-Language</code>`
> +  <li>`<code title>Content-Language</code>`
> +  <li>`<code title>Content-Type</code>` and whose <span title=concept-header-value>value</span>,
> +  <span title=concept-header-parse>once parsed</span>, has a MIME type (ignoring parameters)
> +  that is `<code title>application/x-www-form-urlencoded</code>`,
> +  `<code title>multipart/form-data</code>`, or `<code title>text/plain</code>`
> +  <li>`<code title><a href=https://html.spec.whatwg.org/multipage/comms.html#last-event-id>Last-Event-ID</a></code>`
> +  <li>`<code title><a href=http://httpwg.org/http-extensions/client-hints.html#the-dpr-client-hint>DPR</a></code>`,
> +  `<code title><a href=http://httpwg.org/http-extensions/client-hints.html#the-downlink-client-hint>Downlink</a></code>`,
> +  `<code title><a href=http://httpwg.org/http-extensions/client-hints.html#the-save-data-hint>Save-Data</a></code>`,
> +  `<code title><a href=http://httpwg.org/http-extensions/client-hints.html#the-viewport-width-client-hint>Viewport-Width</a></code>`, or
> +  `<code title><a href=http://httpwg.org/http-extensions/client-hints.html#the-width-client-hint>Width</a></code>`, and whose value, once parsed, is not a failure.

value and once parsed need to be cross-referenced.

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