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 (wrapper_.IsEmpty()) {
    wrapper_.Reset(isolate(), GetWrapper());
  }
}
void URLRequest::Unpin() {
  wrapper_.Reset();
}
template <typename... Args>
void URLRequest::EmitRequestEvent(Args... args) {
  v8::HandleScope handle_scope(isolate());
  mate::CustomEmit(isolate(), GetWrapper(), "_emitRequestEvent", args...);
}
template <typename... Args>
void URLRequest::EmitResponseEvent(Args... args) {
  v8::HandleScope handle_scope(isolate());
  mate::CustomEmit(isolate(), GetWrapper(), "_emitResponseEvent", args...);
}
}  
}