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.h
public:
    RequestState();
    bool NotStarted() const;
    bool Started() const;
    bool Finished() const;
    bool Canceled() const;
    bool Failed() const;
    bool Closed() const;
  };
  enum class ResponseStateFlags {
    kNotStarted = 0x0,
    kStarted = 0x1,
    kEnded = 0x2,
    kFailed = 0x4
  };
  class ResponseState : public StateBase<ResponseStateFlags> {
   public:
    ResponseState();
    bool NotStarted() const;
    bool Started() const;
    bool Ended() const;
    bool Canceled() const;
    bool Failed() const;
    bool Closed() const;
  };
  bool NotStarted() const;
  bool Finished() const;
  bool Canceled() const;