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
scoped_refptr<const net::AuthChallengeInfo> auth_info) {
  if (request_state_.Canceled() || request_state_.Closed()) {
    return;
  }
  DCHECK(atom_request_);
  if (!atom_request_) {
    return;
  }
  Emit("login", auth_info.get(),
       base::Bind(&AtomURLRequest::PassLoginInformation, atom_request_));
}
void URLRequest::OnResponseStarted(
    scoped_refptr<net::HttpResponseHeaders> response_headers) {
  if (request_state_.Canceled() || request_state_.Failed() ||
      request_state_.Closed()) {
    
    return;
  }
  response_headers_ = response_headers;
  response_state_.SetFlag(ResponseStateFlags::kStarted);
  Emit("response");
}
void URLRequest::OnResponseData(