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Use outside settings object to fetch workers
As discussed in #1122, #1111, and in w3c/ServiceWorker#889 (comment), a number of problems are caused by the current setup of using the settings object of the worker itself as the feth client. Instead, we use the incumbent settings object to do the fetching. (Incumbent, instead of e.g. current, because almost everything else in the (Shared)Worker constructors uses the incumbent settings object.) Notably, for fetching module script trees, this necessitates separating the fetch client settings object from the one used for the module map. This fixes #1111 since now module workers are fetched with the correct client, and thus automatically get the correct referrer.
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