### 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
const gfx::Size& pref_size) {
  Emit("preferred-size-changed", pref_size);
}
bool WebContents::CanOverscrollContent() {
  return false;
}
std::unique_ptr<content::EyeDropper> WebContents::OpenEyeDropper(
    content::RenderFrameHost* frame,
    content::EyeDropperListener* listener) {
  return ShowEyeDropper(frame, listener);
}
void WebContents::RunFileChooser(
    content::RenderFrameHost* render_frame_host,
    scoped_refptr<content::FileSelectListener> listener,
    const blink::mojom::FileChooserParams& params) {
  FileSelectHelper::RunFileChooser(render_frame_host, std::move(listener),
                                   params);
}
void WebContents::EnumerateDirectory(
    content::WebContents* ontents,
    scoped_refptr<content::FileSelectListener> listener,
    const base::FilePath& path) {
  FileSelectHelper::EnumerateDirectory(ontents, std::move(listener), path);
}
bool WebContents::IsFullscreenForTabOrPending(