### 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.cc
return g_browser_client;
}
void ElectronBrowserClient::SetApplicationLocale(const std::string& locale) {
  if (!BrowserThread::IsThreadInitialized(BrowserThread::IO) ||
      !content::GetIOThreadTaskRunner({})->PostTask(
          FROM_HERE, base::BindOnce(&SetApplicationLocaleOnIOThread, locale))) {
    g_io_thread_application_locale.Get() = locale;
  }
  *g_application_locale = locale;
}
ElectronBrowserClient::ElectronBrowserClient() {
  DCHECK(!g_browser_client);
  g_browser_client = this;
}
ElectronBrowserClient::~ElectronBrowserClient() {
  DCHECK(g_browser_client);
  g_browser_client = nullptr;
}
content::WebContents* ElectronBrowserClient::GetWebContentsFromProcessID(
    int process_id) {
  
  
  const auto iter = pending_processes_.find(process_id);
  if (iter != std::end(pending_processes_))
    return iter->second;
  
  
  return WebContentsPreferences::GetWebContentsFromProcessID(process_id);
}
content::SiteInstance* ElectronBrowserClient::GetSiteInstanceFromAffinity(