[whatwg/xhr] `ProgressEvent.loaded` references decompressed length, but `total` references the Content-Length header (Issue #403)

cutiful created an issue (whatwg/xhr#403)

### What is the issue with the XMLHttpRequest Standard?

(Continuing from #388.) When processing a response body, `loaded` on `ProgressEvent` is calculated after codings are handled in the Fetch specification, i. e. decompressed data size. However, `total` is unconditionally the result of _extracting a length_ from the Content-Length header, which references compressed length when Content-Encoding is set to a known encoding. In those cases, the XHR specification should initialize _length_ to zero. That would make `lengthComputable` false, which is the expected behavior for compressed responses.

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