[w3c/ServiceWorker] Do not remove the race response map entry in Lookup Race Response (PR #1807)

This change is based on the discussion in https://github.com/whatwg/fetch/pull/1737. We don't have to remove the entry from the race response map in the lookup-race-response-algorithm, as we don't want to limit de-deprecating the fetch(e.request) call once triggered in the fetch handler. fetch(e.request) can be called multiple times in one fetch handler.

Actually this removal is redundant, because the map entry is removed in [the step 20 of the Create Fetch Event and Dispatch](https://w3c.github.io/ServiceWorker/#ref-for-serviceworkerglobalscope-race-response-map%E2%91%A1:~:text=If%20activeWorker%E2%80%99s%20global%20object%E2%80%99s%20race%20response%20map%5Brequest%5D%20exists%2C%20remove%20activeWorker%E2%80%99s%20global%20object%E2%80%99s%20race%20response%20map%5Brequest%5D.) anyway, this ensures that the added entry is removed.


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  https://github.com/w3c/ServiceWorker/pull/1807

-- Commit Summary --

  * Do not remove the race response map entry in Lookup Race Response

-- File Changes --

    M index.bs (1)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1807.patch
https://github.com/w3c/ServiceWorker/pull/1807.diff

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