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### Issue Details

* **Electron Version:**
  * 9.1.1
  * 10.0.0-beta.4
* **Operating System:**
  * Linux x64

### Expected Behavior

Don't crash when `nodeIntegrationInWorker` is `true` and a service worker is being registered. :slightly_smiling_face:

### Actual Behavior

A crash occurs once the service worker is attempted to be registered (blank page, DevTools disconnects).

### To Reproduce

Attempt to register a service worker with `nodeIntegrationInWorker` set to `true`.

```sh
$ git clone https://github.com/lgrahl/electron-node-integration-service-worker-crash
$ npm install
$ npm start
```

Commit https://github.com/lgrahl/electron-node-integration-service-worker-crash/commit/97b14f2c599bfd25ce416b8a7ee91d9122bbfe2c
shell/browser/electron_browser_client.cc
base::FilePath path;
  if (base::PathService::Get(base::DIR_HOME, &path))
    path = path.Append(FILE_PATH_LITERAL("Downloads"));
  return path;
}
scoped_refptr<network::SharedURLLoaderFactory>
ElectronBrowserClient::GetSystemSharedURLLoaderFactory() {
  if (!g_browser_process)
    return nullptr;
  return g_browser_process->shared_url_loader_factory();
}
void ElectronBrowserClient::OnNetworkServiceCreated(
    network::mojom::NetworkService* network_service) {
  if (!g_browser_process)
    return;
  g_browser_process->system_network_context_manager()->OnNetworkServiceCreated(
      network_service);
}
std::vector<base::FilePath>
ElectronBrowserClient::GetNetworkContextsParentDirectory() {
  base::FilePath user_data_dir;
  base::PathService::Get(DIR_USER_DATA, &user_data_dir);
  DCHECK(!user_data_dir.empty());
  return {user_data_dir};
}
std::string ElectronBrowserClient::GetProduct() {