Re: [webcomponents] Large custom element spec rewrite to implement some F2F decisions (#405)

>  
> -    <li>Let <var>NAME</var> be <var>EXTENDS</var></li>
> -    <li>Let <var>ERROR</var> be the result of running the <a>element registration algorithm</a> with <var>DOCUMENT</var>, <var>TYPE</var>, <var>PROTOTYPE</var>, and <var>NAME</var> as arguments</li>
> -    <li>If <var>ERROR</var> is <code>InvalidType</code>, <a href="https://heycam.github.io/webidl/#dfn-throw">throw</a> a <code>SyntaxError</code> and <strong>stop</strong>.</li>
> -    <li>If <var>ERROR</var> is not <code>None</code>, <a href="https://heycam.github.io/webidl/#dfn-throw">throw</a> a <code>NotSupportedError</code> and <strong>stop</strong>.</li>
> -    <li>Return result of running <a data-lt="custom element constructor generation algorithm">custom element constructor generation algorithm</a> with <var>PROTOTYPE</var>, <var>FUNCTION</var>, and <var>DOCUMENT</var> as arguments.</li>
> -</ol>
> -</div>
> +    <li>Perform <var>element</var>.[[\SetPrototypeOf]](<var>prototype</var>). Rethrow any exceptions.</li>

It's probably best if performed this inside the HTMLElement constructor so that in the case the constructor throws before finishing super call, we wouldn't leave the element in a weird state.

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https://github.com/w3c/webcomponents/pull/405/files#r54660611