refactor(TestScheduler): remove getUnsubscriptionFrame()
refactor(TestScheduler): remove getUnsubscriptionFrame()

Replace unnecessary getUnsubscriptionFrame() with
parseMarblesAsSubscriptions().unsubscribedFrame.

gluck/RxJS,benlesh/RxJS,jinroh/RxJS,adrianomelo/RxJSNext,jinroh/RxJS,benlesh/RxJS,martinsik/rxjs,adrianomelo/RxJS-1,staltz/RxJSNext,Igorbek/rxjs5,gluck/RxJS,kwonoj/RxJS,mattpodwysocki/RxJS,adrianomelo/RxJSNext,kwonoj/RxJS,ReactiveX/RxJS,Brocco/RxJS,ReactiveX/rxjs,kwonoj/RxJS,saneyuki/RxJS,jadbox/RxJS,kwonoj/RxJS,adrianomelo/RxJS-1,Igorbek/rxjs5,jayphelps/rxjs,robwormald/RxJS,trxcllnt/RxJS,RxJS-CN/RxJS-Docs-CN,ReactiveX/rxjs,SangKa/RxJS-Docs-CN,elliotschi/rxjs,robwormald/RxJS,jayphelps/rxjs,ReactiveX/rxjs,adrianomelo/RxJS-1,jadbox/RxJS,jayphelps/rxjs,adrianomelo/RxJSNext,staltz/RxJSNext,trxcllnt/RxJS,adrianomelo/RxJSNext,jayphelps/rxjs,Igorbek/rxjs5,gluck/RxJS,adrianomelo/RxJS-1,staltz/RxJSNext,martinsik/rxjs,jinroh/RxJS,jadbox/RxJS,IgorMinar/RxJS,elliotschi/rxjs,ReactiveX/RxJS,benlesh/RxJS,benlesh/RxJS,SangKa/RxJS-Docs-CN,justinwoo/RxJS,Brocco/RxJS,RxJS-CN/RxJS-Docs-CN,jinroh/RxJS,Brocco/RxJS,martinsik/rxjs,ReactiveX/RxJS,saneyuki/RxJS,mattpodwysocki/RxJS,trxcllnt/RxJS,SangKa/RxJS-Docs-CN,jayphelps/rxjs,mattpodwysocki/RxJS,IgorMinar/RxJS,robwormald/RxJS,ReactiveX/rxjs,robwormald/RxJS,ReactiveX/RxJS,Igorbek/rxjs5,figueredo/RxJS,mattpodwysocki/RxJS,figueredo/RxJS,Brocco/RxJS,gluck/RxJS,RxJS-CN/RxJS-Docs-CN,justinwoo/RxJS,justinwoo/RxJS,trxcllnt/RxJS,staltz/RxJSNext,martinsik/rxjs,justinwoo/RxJS,figueredo/RxJS,elliotschi/rxjs,figueredo/RxJS,jadbox/RxJS,RxJS-CN/RxJS-Docs-CN,elliotschi/rxjs,SangKa/RxJS-Docs-CN