### 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_context.h
void set_in_memory_pref_store(ValueMapPrefStore* pref_store) {
    in_memory_pref_store_ = pref_store;
  }
  ValueMapPrefStore* in_memory_pref_store() const {
    return in_memory_pref_store_;
  }
  base::WeakPtr<ElectronBrowserContext> GetWeakPtr() {
    return weak_factory_.GetWeakPtr();
  }
#if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
  extensions::ElectronExtensionSystem* extension_system() {
    
    
    DCHECK(!IsOffTheRecord());
    return extension_system_;
  }
#endif
  ProtocolRegistry* protocol_registry() const {
    return protocol_registry_.get();
  }
  void SetSSLConfig(network::mojom::SSLConfigPtr config);
  network::mojom::SSLConfigPtr GetSSLConfig();
  void SetSSLConfigClient(mojo::Remote<network::mojom::SSLConfigClient> client);
  ~ElectronBrowserContext() override;
 private:
  ElectronBrowserContext(const std::string& partition,
                         bool in_memory,
                         base::DictionaryValue options);
  
  void InitPrefs();