* [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
base::OnceClosure resume) {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  v8::HandleScope handle_scope(isolate());
  auto array_buffer = v8::ArrayBuffer::New(isolate(), string_piece.size());
  auto backing_store = array_buffer->GetBackingStore();
  memcpy(backing_store->Data(), string_piece.data(), string_piece.size());
  Emit("data", array_buffer);
  std::move(resume).Run();
}
void SimpleURLLoaderWrapper::OnComplete(bool success) {