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
#include "atom/browser/api/atom_api_url_request.h"
#include <string>
#include "atom/browser/api/atom_api_session.h"
#include "atom/browser/net/atom_url_request.h"
#include "atom/common/api/event_emitter_caller.h"
#include "atom/common/native_mate_converters/callback.h"
#include "atom/common/native_mate_converters/net_converter.h"
#include "atom/common/native_mate_converters/string16_converter.h"
#include "atom/common/node_includes.h"
#include "native_mate/dictionary.h"
namespace mate {
template <>
struct Converter<scoped_refptr<const net::IOBufferWithSize>> {
  static v8::Local<v8::Value> ToV8(
      v8::Isolate* isolate,
      scoped_refptr<const net::IOBufferWithSize> buffer) {
    return node::Buffer::Copy(isolate, buffer->data(), buffer->size())
        .ToLocalChecked();
  }
  static bool FromV8(v8::Isolate* isolate,