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
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  delegate_ = nullptr;
  content::BrowserThread::PostTask(
      content::BrowserThread::IO, FROM_HERE,
      base::Bind(&AtomURLRequest::DoTerminate, this));
}
void AtomURLRequest::DoInitialize(
    scoped_refptr<net::URLRequestContextGetter> request_context_getter,
    const std::string& method,
    const std::string& url) {
  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
  DCHECK(request_context_getter);
  request_context_getter_ = request_context_getter;
  request_context_getter_->AddObserver(this);
  auto context = request_context_getter_->GetURLRequestContext();
  if (!context) {
    
    DoCancelWithError("Cannot start a request after shutdown.", true);
    return;
  }
  DCHECK(context);
  request_ = context->CreateRequest(
      GURL(url), net::RequestPriority::DEFAULT_PRIORITY, this);
  if (!request_) {
    DoCancelWithError("Failed to create a net::URLRequest.", true);
    return;
  }
  request_->set_method(method);
}
void AtomURLRequest::DoTerminate() {