[whatwg/xhr] Early return step needed for cancelled send()? (#101)

Step 10.{1,2} for an async send() ( https://xhr.spec.whatwg.org/#dom-xmlhttprequest-send ) fire 'loadstart'(s). The event handling code could side-effect the state of the XHR object (calling abort() or re-initiate another send() by re-opening), should it so wish.

The spec doesn't _appear_ to account for that possibility upon return and continuing on to step 10.3.

This came up (indirectly) via https://crbug.com/642242

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