### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/main/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/main/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 bug report that matches the one I want to file, without success.

### Electron Version

16.0.0

### What operating system are you using?

Windows

### Operating System Version

WIN10 20H2

### What arch are you using?

x64

### Last Known Working Electron version

_No response_

### Expected Behavior

 win.webContents.savePage('d:/aaaaaa.html', 'HTMLComplete').then(() => {
      console.log('Page was saved successfully.')
    }).catch(err => {
      console.log(err)
    })

it will generate a html page file at d: 

### Actual Behavior

savePage has three formats that can be used

if use HTMLComplete
 only produced a aaaaaa_files empty folder

if use HTMLonly 
No files are generated nor error callbacks are generated

MHTML option works fine

### Testcase Gist URL

_No response_

### Additional Information

_No response_
shell/browser/api/electron_api_web_contents.cc
if (owner_window) {
    owner_window_ = owner_window->GetWeakPtr();
    NativeWindowRelay::CreateForWebContents(ontents,
                                            owner_window->GetWeakPtr());
  } else {
    owner_window_ = nullptr;
    ontents->RemoveUserData(NativeWindowRelay::UserDataKey());
  }
#if BUILDFLAG(ENABLE_OSR)
  auto* osr_wcv = GetOffScreenWebContentsView();
  if (osr_wcv)
    osr_wcv->SetNativeWindow(owner_window);
#endif
}
content::WebConbContents::GetWebContents() const {
  if (!inspectable_ontents_)
    return nullptr;
  return inspectable_ontents_->GetWebContents();
}
content::WebConbContents::GetDevToolsWebContents() const {
  if (!inspectable_ontents_)
    return nullptr;
  return inspectable_ontents_->GetDevToolsWebContents();
}
void WebContents::WebContentsDestroyed() {
   Clear the pointer stored in wrapper.
  if (GetAllWebContents().Lookup(id_))
    GetAllWebContents().Remove(id_);
  v8::Isolate* isolate = JavascriptEnvironment::GetIsolate();
  v8::HandleScope scope(isolate);