Bug 1014466 - Part 1: Only send readystatechange event when state changed. r=khuey
Bug 1014466 - Part 2: Allow setting responseType after abort() or new open(). r=khuey
Bug 1014466 - Part 3: Test case for async XHR reuse. r=khuey CLOSED TREE

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extra : amend_source : 8acf4dcfb1a04829150c4e35cdf383464d6f2405