s/originLabelsSeen/labelsSeen and set def

Co-authored-by: Emil Lundberg <[email protected]>

index.bs

@@ -4115,7 +4115,7 @@ To validate the calling origin is an authorized related origin for a given cerem
     1. If the fetch fails, the response does not have a content type of `application/json`, or does not have a status code (after following redirects) of 200, then throw a "{{SecurityError}}" {{DOMException}}.
     1. If the body of the resource is not a valid JSON object, then throw a "{{SecurityError}}" {{DOMException}}.
     1. If the value of the |origins| property of the JSON object is missing, or is not an array of strings, then throw a "{{SecurityError}}" {{DOMException}}.
-1. Let |originLabelsSeen| be an empty set.
+1. Let |labelsSeen| be a new empty [=set=].
 1. [=set/For each=] string in |origins|:
     1. Let |url| be the result of parsing the string as a URL. If that fails, [=continue=].
     1. Let |domain| be the [=effective domain=] of |url|. If that is null, [=continue=].