### Preflight Checklist

* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for an issue that matches the one I want to file, without success.

### Issue Details

* **Electron Version:**
* 9.0.0, 9.2.0, 9.2.1 0 All broken

* **Operating System:**
  * Windows 10 (1809)
* **Last Known Working Electron version:**
  * 8.5.0

### Expected Behavior
When requesting url's and having a socket connect, when it is rejected with proxy authentication required, consistently try again with the proxy authentication credentials.

### Actual Behavior
See logs - good and bad.
In the good logs, electron always makes a 2nd socket request with the proxy authentication headers and succeeds. In the bad logs, electron does not make a 2nd socket request.
Note that for the first socket request on a web page, it works, but when a second socket is opened to make requests it seems to fail.

### To Reproduce
Be behind a NTLM proxy that requires authentication for a domain
Visit a website that makes multiple requests so that multiple sockets are opened.

shell/browser/net/proxying_url_loader_factory.cc
int error_code) {
  if (error_code != net::OK) {
    OnRequestError(network::URLLoaderCompletionStatus(error_code));
    return;
  }
  if (!current_request_uses_header_client_ && !redirect_url_.is_empty()) {
    if (for_cors_preflight_) {
      
      OnRequestError(network::URLLoaderCompletionStatus(net::ERR_FAILED));
      return;
    }
    HandleBeforeRequestRedirect();
    return;
  }
  if (proxied_client_receiver_.is_bound())
    proxied_client_receiver_.Resume();
  auto continuation = base::BindRepeating(
      &InProgressRequest::ContinueToSendHeaders, weak_factory_.GetWeakPtr());