Re: [whatwg/dom] Restore active custom element constructor map entries after construction (PR #1494)

@keithamus commented on this pull request.



> +     <li><p>If <var>previousRegistry</var> is null, then <a for=map>remove</a> the
+     <a>surrounding agent</a>'s
+     <a for="similar-origin window agent">active custom element constructor map</a>[<var>C</var>].
 
-      <p class=note>Under normal circumstances it will already have been removed at this point.
+     <li><p>Otherwise, <a for=map>set</a> the <a>surrounding agent</a>'s
+     <a for="similar-origin window agent">active custom element constructor map</a>[<var>C</var>] to
+     <var>previousRegistry</var>.

The HTML spec has these two steps combined, but DOM has them as 2 discrete steps. Any particular reason why? 

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