* [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:**
  * 7.0.0-beta.7
* **Operating System:**
  * Windows 10
* **Last Known Working Electron version:**
  * 6

### Expected Behavior
Cookies are received

### Actual Behavior
response.headers["set-cookie"] never contains cookies

### To Reproduce
Do a request using the net module as described here: https://electronjs.org/docs/api/net
to any site that will return cookies.

shell/browser/api/atom_api_url_loader.cc
if (success) {
    Emit("complete");
  } else {
    Emit("error", net::ErrorToString(loader_->NetError()));
  }
  loader_.reset();
  pinned_wrapper_.Reset();
  pinned_chunk_pipe_getter_.Reset();
}
void SimpleURLLoaderWrapper::OnRetry(base::OnceClosure start_retry) {}
void SimpleURLLoaderWrapper::OnResponseStarted(
    const GURL& final_url,
    const network::mojom::URLResponseHead& response_head) {
  gin::Dictionary dict = gin::Dictionary::CreateEmpty(isolate());
  dict.Set("statusCode", response_head.headers->response_code());
  dict.Set("statusMessage", response_head.headers->GetStatusText());
  dict.Set("headers", response_head.headers.get());
  dict.Set("httpVersion", response_head.headers->GetHttpVersion());
  Emit("response-started", final_url, dict);
}
void SimpleURLLoaderWrapper::OnRedirect(