- Fixes bug #23142.
- Bug was occurring only with ActionController::API, because `_process_options` wasn't being run for API requests, even though it was being run for normal app requests.
Since all controller instances are required to have a request and
response object, RackDelegation is no longer needed (we always have to
delegate to the response)
ParamsWrapper was initially removed from API controllers according to
the following discusision:
https://github.com/rails-api/rails-api/issues/33
However, we're including it again so Rails API devs can decide
whether to enable or disable it.