refactor(core): use ngOnDestroy in providers

Note about the addition of `beforeEach(fakeAsync(inject(…))))` in some tests:
`ApplicationRef` is now using `ngOnDestroy` and there is eager,
including all of its dependencies which contain `NgZone`.
The additional `fakeAsync` in `beforeEach` ensures that `NgZone`
uses the fake async zone as parent, and not the root zone.

BREAKING CHANGE (via deprecations):
- `ApplicationRef.dispose` is deprecated. Destroy the module that was
   created during bootstrap instead by calling `NgModuleRef.destroy`.
- `AplicationRef.registerDisposeListener` is deprecated.
   Use the `ngOnDestroy` lifecycle hook for providers or
   `NgModuleRef.onDestroy` instead.
- `disposePlatform` is deprecated. Use `destroyPlatform` instead.
- `PlatformRef.dipose()` is deprecated. Use `PlatformRef.destroy()`
   instead.
- `PlatformRef.registerDisposeListener` is deprecated. Use
  `PlatformRef.onDestroy` instead.
- `PlaformRef.diposed` is deprecated. Use `PlatformRef.destroyed`
  instead.

modules/@angular/forms/test/reactive_integration_spec.ts

@@ -116,30 +116,28 @@ export function main() {
        })));
 
     it('should mark formGroup as submitted on submit event',
-       inject([TestComponentBuilder], fakeAsync((tcb: TestComponentBuilder) => {
-                const t = `<div>
+       fakeAsync(inject([TestComponentBuilder], (tcb: TestComponentBuilder) => {
+         const t = `<div>
                       <form #f="ngForm" [formGroup]="form" (ngSubmit)="data=f.submitted"></form>
                       <span>{{data}}</span>
                     </div>`;
 
-                var fixture: ComponentFixture<MyComp8>;
+         var fixture: ComponentFixture<MyComp8>;
 
-                tcb.overrideTemplate(MyComp8, t).createAsync(MyComp8).then((root) => {
-                  fixture = root;
-                });
-                tick();
+         tcb.overrideTemplate(MyComp8, t).createAsync(MyComp8).then((root) => { fixture = root; });
+         tick();
 
-                fixture.debugElement.componentInstance.form = new FormGroup({});
-                fixture.debugElement.componentInstance.data = false;
+         fixture.debugElement.componentInstance.form = new FormGroup({});
+         fixture.debugElement.componentInstance.data = false;
 
-                tick();
+         tick();
 
-                var form = fixture.debugElement.query(By.css('form'));
-                dispatchEvent(form.nativeElement, 'submit');
+         var form = fixture.debugElement.query(By.css('form'));
+         dispatchEvent(form.nativeElement, 'submit');
 
-                tick();
-                expect(fixture.debugElement.componentInstance.data).toEqual(true);
-              })));
+         tick();
+         expect(fixture.debugElement.componentInstance.data).toEqual(true);
+       })));
 
     it('should work with single controls',
        inject(