Re: [whatwg/streams] ReadableStream should be an async iterable (#778)

@liudonghua123 You shouldn't use `getReader()` or `reader.read()` in this case, instead you should `for await` over the `ReadableStream` itself:
```javascript
const readable = response.body;
if (!readable) {
  throw new Error('Failed to get response body');
}
let receivedLength = 0;
let chunks = []; 
for await (const value of readable) {
  chunks.push(value);
  receivedLength += value.length;
  console.log(`Received ${receivedLength} of ${contentLength}`)
}
```
[MDN has more examples on async-iterating a stream.](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream#async_iteration_of_a_stream_using_for_await...of) 😉 

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