[whatwg/xhr] features request:add SynXMLHttpRequest for Avoid Callback Hell Programming (#323)

Avoid Callback Hell Programming from XMLHttpRequest

**Add New Function**

**SynXMLHttpRequest**

var xml=new SynXMLHttpRequest() ;
xml.open('GET', 'test.php');
xml.send(FormData);
var rs=JSON.parse(xml.result);
console.log(rs);

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