https://bugs.webkit.org/show_bug.cgi?id=126575

Source/WebCore:

Patch by Youenn Fablet <youennf@gmail.com> on 2014-01-13
Reviewed by Alexey Proskuryakov.

Added sending of progress event after readystatechange event (switching to DONE state) in case of abort, error or timeout.
Fixed assertions in XMLHttpRequestProgressEventThrottle and XMLHttpRequestUpload.

* xml/XMLHttpRequest.cpp:
(WebCore::XMLHttpRequest::dispatchErrorEvents): added sending of progress event before the specific error event
* xml/XMLHttpRequestProgressEventThrottle.cpp:
(WebCore::XMLHttpRequestProgressEventThrottle::dispatchProgressEvent): fixed assertion
* xml/XMLHttpRequestUpload.cpp:
(WebCore::XMLHttpRequestUpload::dispatchProgressEvent): fixed assertion

LayoutTests:

Patch by Youenn Fablet <youennf@gmail.com> on 2014-01-13
Reviewed by Alexey Proskuryakov.

Updated onloadend-event-after-abort.html and onloadend-event-after-error.html to check for progress ev...