Description[WIP] XMLHttpRequest should parse as it receives chunks.
Before this patch, XMLHttpRequest delayed parsing the received data until
responseXML getter was invoked.
This patch changes XHR to parse as it receives new data.
By invoking |DocumentParser::appendBytes()| from |didReceiveData|,
|m_responseDocument| DOM is created asynchronously.
BUG=402261
Patch Set 1 #Patch Set 2 : clean ups #Patch Set 3 : add test #
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