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[x] feature request
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Current behavior
When you provide a service using useFactory, ngOnDestroy will never be called.

Expected behavior
Regardless of how you provide the service, ngOnDestroy should get called if it is a method on the service.

Minimal reproduction of the problem with instructions
https://plnkr.co/edit/aUaz6ewyM3m5JorsAoCO?p=preview

1. Open the console.
2. Click the "Create Component" button one or many times
3. After a 2 second delay the component will be destroyed, but no console output will be seen.
4. If you replace useFactory with useClass the problem goes away and you'll see output.

What is the motivation / use case for changing the behavior?
There are many cases, main motivator is that this isn't intuitive.

Please tell us about your environment:

• Angular version: 2.4.8

• Browser: Chrome 56.0.2924.87

• Language: TypeScript 2.0

• Node (for AoT issues): node --version =