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
bool Failed() const;
  bool Write(scoped_refptr<const net::IOBufferWithSize> buffer, bool is_last);
  void Cancel();
  bool SetExtraHeader(const std::string& name, const std::string& value);
  void RemoveExtraHeader(const std::string& name);
  void SetChunkedUpload(bool is_chunked_upload);
  int StatusCode() const;
  std::string StatusMessage() const;
  net::HttpResponseHeaders* RawResponseHeaders() const;
  uint32_t ResponseHttpVersionMajor() const;
  uint32_t ResponseHttpVersionMinor() const;
  void Close();
  void Pin();
  void Unpin();
  template <typename... Args>
  void EmitRequestEvent(Args... args);
  template <typename... Args>
  void EmitResponseEvent(Args... args);
  scoped_refptr<AtomURLRequest> atom_request_;
  RequestState request_state_;
  ResponseState response_state_;
  
  v8::Global<v8::Object> wrapper_;
  scoped_refptr<net::HttpResponseHeaders> response_headers_;
  DISALLOW_COPY_AND_ASSIGN(URLRequest);
};
}  
}  
#endif