Re: [w3c/ServiceWorker] Use new Streams algorithms (#1533)

@domenic commented on this pull request.



>                      1. Let |highWaterMark| be a non-negative, non-NaN number, chosen by the user agent.
                     1. Let |sizeAlgorithm| be an algorithm that accepts a [=chunk=] object and returns a non-negative, non-NaN, non-infinite number, chosen by the user agent.
-                    1. Let |pull| be an action that runs these subsubsteps:
-                        1. Let |promise| be the result of [=read a chunk|reading a chunk=] from |response|'s [=response/body=]'s [=stream=] with |reader|.
-                        1. When |promise| is fulfilled with an object whose `done` property is false and whose `value` property is a `Uint8Array` object, append the bytes represented by the `value` property to |bytes| and perform ! [=DetachArrayBuffer=] with the `ArrayBuffer` object wrapped by the `value` property.
-                        1. When |promise| is fulfilled with an object whose `done` property is true, set |end-of-body| to true.
-                        1. When |promise| is fulfilled with a value that matches with neither of the above patterns, or |promise| is rejected, [=ReadableStream/error=] |newStream| with a `TypeError`.
-                    1. Let |cancel| be an action that [=ReadableStream/cancels=] |response|'s [=response/body=]'s [=stream=] with |reader|.
-                    1. Let |newStream| be the result of [=ReadableStream/construct a ReadableStream object=] with |highWaterMark|, |sizeAlgorithm|, |pull|, and |cancel| in |targetRealm|.
+                    1. Let |newStream| be the result of [=ReadableStream/creating=] a {{ReadableStream}} with <a for=ReadableStream/create><var ignore>pullAlgorithm</var></a> set to |pullAlgorithm|, <a for=ReadableStream/create><var ignore>cancelAlgorithm</var></a> set to |cancelAlgorithm|, <a for=ReadableStream/create><var ignore>highWaterMark</var></a> set to |highWaterMark|, and <a for=ReadableStream/create><var ignore>sizeAlgorithm</var></a> set to |sizeAlgorithm|, in |targetRealm|.

Yeah, see https://github.com/tabatkins/bikeshed/issues/1758

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