Will be nice to clear auth credentials. For example, I'm using a proxy that accepts options via username:

```
proxy.com:8080
user: wiliam_country_US
```

So, if I want to change the peer node, I change my username:

```
proxy.com:8080
user: wiliam_country_GB
```

But, I'm not changing the proxy, so electron has valid credentials and is not going to trigger `login` event.

I'm searching the way to clean auth settings so electron asks them again.
atom/browser/api/atom_api_url_request.cc
if (!request_state_.NotStarted()) {
    
    return;
  }
  DCHECK(atom_request_);
  if (atom_request_) {
    atom_request_->RemoveExtraHeader(name);
  }
}
void URLRequest::SetChunkedUpload(bool is_chunked_upload) {
  
  if (!request_state_.NotStarted()) {
    
    return;
  }
  DCHECK(atom_request_);
  if (atom_request_) {
    atom_request_->SetChunkedUpload(is_chunked_upload);
  }
}
void URLRequest::OnAuthenticationRequired(