fix(AjaxObservable): Fix for #1921 exposed AjaxObservable unsubscription error calling xhr.abort().
fix(AjaxObservable): Fix for #1921 exposed AjaxObservable unsubscription error calling xhr.abort().

Possibly only an artifact of test utils, but after applying fix for #1921 started getting an error

that xhr.abort() in AjaxObservable's unsubscribe call wasn't a function.

staltz/RxJSNext,adrianomelo/RxJSNext,benlesh/RxJS,IgorMinar/RxJS,ReactiveX/rxjs,adrianomelo/RxJSNext,SangKa/RxJS-Docs-CN,benlesh/RxJS,ReactiveX/RxJS,adrianomelo/RxJS-1,martinsik/rxjs,ReactiveX/rxjs,trxcllnt/RxJS,trxcllnt/RxJS,ReactiveX/rxjs,IgorMinar/RxJS,jayphelps/rxjs,RxJS-CN/RxJS-Docs-CN,staltz/RxJSNext,jayphelps/rxjs,adrianomelo/RxJS-1,staltz/RxJSNext,SangKa/RxJS-Docs-CN,ReactiveX/RxJS,adrianomelo/RxJS-1,trxcllnt/RxJS,staltz/RxJSNext,Brocco/RxJS,benlesh/RxJS,jayphelps/rxjs,adrianomelo/RxJS-1,martinsik/rxjs,RxJS-CN/RxJS-Docs-CN,Brocco/RxJS,kwonoj/RxJS,SangKa/RxJS-Docs-CN,jayphelps/rxjs,kwonoj/RxJS,ReactiveX/rxjs,RxJS-CN/RxJS-Docs-CN,benlesh/RxJS,adrianomelo/RxJSNext,trxcllnt/RxJS,ReactiveX/RxJS,martinsik/rxjs,kwonoj/RxJS,Brocco/RxJS,jayphelps/rxjs,kwonoj/RxJS,ReactiveX/RxJS,RxJS-CN/RxJS-Docs-CN,martinsik/rxjs,SangKa/RxJS-Docs-CN,adrianomelo/RxJSNext,Brocco/RxJS