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/net/atom_url_request.cc
content::BrowserThread::UI, FROM_HERE,
        base::Bind(&AtomURLRequest::InformDelegateResponseCompleted, this));
    DoTerminate();
  } else if (data_transfer_error) {
    
    DoCancelWithError("Failed to transfer data from IO to UI thread.", false);
  }
}
void AtomURLRequest::OnContextShuttingDown() {
  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
  DoCancel();
}
bool AtomURLRequest::CopyAndPostBuffer(int bytes_read) {
  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
  
  
  auto buffer_copy = new net::IOBufferWithSize(bytes_read);
  memcpy(buffer_copy->data(), response_read_buffer_->data(), bytes_read);
  return content::BrowserThread::PostTask(
      content::BrowserThread::UI, FROM_HERE,
      base::Bind(&AtomURLRequest::InformDelegateResponseData, this,
                 buffer_copy));
}
void AtomURLRequest::InformDelegateAuthenticationRequired(
    scoped_refptr<net::AuthChallengeInfo> auth_info) const {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  if (delegate_)
    delegate_->OnAuthenticationRequired(auth_info);
}
void AtomURLRequest::InformDelegateResponseStarted(