Re: [whatwg/streams] throw instead of returning Promise.reject() from handlers (#819)

TransformStreamDefaultSinkDefaultTransform has to explicitly return a promise due to the defintion of the PromiseInvokeOrPerformFallback operation. However, since PromiseInvokeOrPerformFallback is only used to call `transform()`, I think I will inline and remove it. Then TransformStreamDefaultSinkDefaultTransform can also go away.

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