[w3c/ServiceWorker] The network fallback should be rejected when the request body is locked or disturbed (#1560)

At the 24th step In https://w3c.github.io/ServiceWorker/#on-fetch-request-algorithm, we should reject the request if the request body is non-null, and it is locked or disturbed, because otherwise we cannot pass the streaming body to the network module.


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https://github.com/w3c/ServiceWorker/issues/1560