### 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

14.0.0-beta.12

### What operating system are you using?

Windows

### Operating System Version

10.0.19042 Build 19042

### What arch are you using?

x64

### Last Known Working Electron version

13

### Expected Behavior

Window should be transparent

### Actual Behavior

Open a window with transparency enabled and delete the dom, the window will be white instead of transparent.
**Also seems like settings the backgroundColor property has no longer an effect.** I always see a white window

```
const {app, BrowserWindow} = require('electron')
const path = require("path");

function createWindow () {
	const mainWindow = new BrowserWindow({
		transparent: true,
		frame: false,
	})

	mainWindow.loadURL('https://example.com')
	mainWindow.webContents.openDevTools()
}

app.whenReady().then(createWindow)
```

### Testcase Gist URL

https://gist.github.com/e124340107f6c4a3ade8b36d98a16b9a

### Additional Information

_No response_
shell/browser/api/electron_api_web_contents.cc
#if defined(OS_WIN)
  
  
  base::ThreadRestrictions::ScopedAllowIO allow_io;
#endif
  scoped_refptr<printing::PrintBackend> print_backend =
      printing::PrintBackend::CreateInstance(
          g_browser_process->GetApplicationLocale());
  std::string printer_name;
  print_backend->GetDefaultPrinterName(printer_name);
  
  
  
  if (printer_name.empty()) {
    printing::PrinterList printers;
    print_backend->EnumeratePrinters(&printers);
    if (!printers.empty())
      printer_name = printers.front().printer_name;
  }
  return base::UTF8ToUTF16(printer_name);
}
scoped_refptr<base::TaskRunner> CreatePrinterHandlerTaskRunner() {