Replace the mutation observer with the ngZone subscribe

[sumitarora]

Replace the mutation observer with the ngZone subscribe ( angular/angular#7045)

var ngRootEl = window.getAllAngularRootElements()[0];
var rootNgProbe = window.ng.probe(ngRootEl);
var appRef = rootNgProbe.inject(window.ng.probe.coreTokens.ApplicationRef);
appRef.tick();

var ngZone = rootNgProbe.inject(window.ng.probe.coreTokens.NgZone);
ngZone.onEventDone.subscribe(function() { console.log('Angular did some work'); });