### 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
content::WebContents::FromRenderFrameHost(render_frame_host);
  if (!web_contents)
    return;
  const GURL& site = render_frame_host->GetSiteInstance()->GetSiteURL();
  if (!site.SchemeIs(extensions::kExtensionScheme))
    return;
  content::BrowserContext* browser_context =
      render_frame_host->GetProcess()->GetBrowserContext();
  auto* extension = extensions::ExtensionRegistry::Get(browser_context)
                        ->enabled_extensions()
                        .GetByID(site.host());
  if (!extension)
    return;
  extensions::ExtensionsBrowserClient::Get()
      ->RegisterBrowserInterfaceBindersForFrame(map, render_frame_host,
                                                extension);
#endif
}
#if BUILDFLAG(IS_LINUX)
void ElectronBrowserClient::GetAdditionalMappedFilesForChildProcess(
    const base::CommandLine& command_line,
    int child_process_id,
    content::PosixFileDescriptorInfo* mappings) {
  int crash_signal_fd = GetCrashSignalFD(command_line);
  if (crash_signal_fd >= 0) {
    mappings->Share(kCrashDumpSignal, crash_signal_fd);
  }
}
#endif
std::unique_ptr<content::LoginDelegate>