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
return request_state_.NotStarted();
}
bool URLRequest::Finished() const {
  return request_state_.Finished();
}
bool URLRequest::Canceled() const {
  return request_state_.Canceled();
}
bool URLRequest::Write(scoped_refptr<const net::IOBufferWithSize> buffer,
                       bool is_last) {
  if (request_state_.Canceled() || request_state_.Failed() ||
      request_state_.Finished() || request_state_.Closed()) {
    return false;
  }
  if (request_state_.NotStarted()) {
    request_state_.SetFlag(RequestStateFlags::kStarted);
    
    Pin();
  }
  if (is_last) {
    request_state_.SetFlag(RequestStateFlags::kFinished);
    EmitRequestEvent(true, "finish");
  }
  DCHECK(atom_request_);
  if (atom_request_) {
    return atom_request_->Write(buffer, is_last);
  }
  return false;
}
void URLRequest::Cancel() {