a241ab7c07
The `addProvider` function in the `UpgradeAdapter` was deprecated in this [commit](https://github.com/angular/angular/commit/d21331e902341abe3fdec267d0acae223c801c52#diff-77163e956a7842149f583846c1c01651) and has been removed in final. Given this, the documentation for downgrading ng2 providers for use in ng1 is invalid.