### 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](https://www.github.com/electron/electron/issues) for a feature request that matches the one I want to file, without success.

### Electron Version

13.1.7

### What operating system are you using?

Windows

### Operating System Version

Windows 10 version 20H2

### What arch are you using?

x64

### Last Known Working Electron version

12.0.15

### Expected Behavior

Checking `navigator.userAgentData` in Chrome 91 returns an array of brands appropriately. Electron 13/14 do not return anything.

This appears to then become a problem for my situation. I am posting a form with hidden variables to a third-party vendor I work with. This form post ultimately loads an iframe.

Expected: As it does in Chrome 91, load the iframe from this third-party vendor.

### Actual Behavior

A header of "sec-ch-ua" is included in the request to the third-party vendor and it is blank. They are rejecting the post because of an invalid header. I suspect this is because Chrome 13/14 does not make this hint data made available correctly.

I tried loading various sites in Chrome 91 that do load brand names in Electron 13/14 and they are empty if you review `navigator.userAgentData`.

### Testcase Gist URL

_No response_

### Additional Information

_No response_
shell/browser/electron_browser_client.h
class PlatformNotificationService;
class ElectronBrowserClient : public content::ContentBrowserClient,
                              public content::RenderProcessHostObserver {
 public:
  static ElectronBrowserClient* Get();
  static void SetApplicationLocale(const std::string& locale);
  ElectronBrowserClient();
  ~ElectronBrowserClient() override;
  
  ElectronBrowserClient(const ElectronBrowserClient&) = delete;
  ElectronBrowserClient& operator=(const ElectronBrowserClient&) = delete;
  using Delegate = content::ContentBrowserClient;
  void set_delegate(Delegate* delegate) { delegate_ = delegate; }
  
  content::WebContents* GetWebContentsFromProcessID(int process_id);
  NotificationPresenter* GetNotificationPresenter();
  void WebNotificationAllowed(content::RenderFrameHost* rfh,
                              base::OnceCallback<void(bool, bool)> callback);
  
  std::vector<std::unique_ptr<content::NavigationThrottle>>
  CreateThrottlesForNavigation(content::NavigationHandle* handle) override;
  
  std::string GetApplicationLocale() override;
  base::FilePath GetFontLookupTableCacheDir() override;
  bool ShouldEnableStrictSiteIsolation() override;
  void BindHostReceiverForRenderer(
      content::RenderProcessHost* render_process_host,
      mojo::GenericPendingReceiver receiver) override;
  void ExposeInterfacesToRenderer(
      service_manager::BinderRegistry* registry,