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### Issue Details

* **Electron Version:**
  10.1.1
* **Operating System:**
  Ubuntu 20.04 + Linux 5.4.0-47-generic
* **Last Known Working Electron version:**
 7.1.2

### Expected Behavior
`webContents.getPrinters()` returns one printer. Besides, the OS provides additional virtual devices.
`webContents.print()` should open the print dialog and show those devices for selection.

### Actual Behavior
`webContents.print()` fails silently; in the print callback, `failureReason` is 'No valid printers available'

### To Reproduce
Just run `webContents.print()`

Electron fiddle: https://gist.github.com/35c5067af8ec104f86bd0cdd4a95b1f5

### Screenshots
![electron-issue](https://user-images.githubusercontent.com/5503002/93387857-3fc9b300-f840-11ea-9335-bf32a3ddea08.png)
![electron-issue](https://user-images.githubusercontent.com/5503002/93387860-40fae000-f840-11ea-938e-09c62f06f06b.gif)


### Additional Information
Upgrading an app built on Electron 7.1.2 that had printing working before

shell/browser/api/electron_api_web_contents.cc
std::vector<printing::PrinterBasicInfo> printers;
  auto print_backend = printing::PrintBackend::CreateInstance(
      g_browser_process->GetApplicationLocale());
  {
     TODO(deepak1556): Deprecate this api in favor of an
     async version and post a non blocing task call.
    base::ThreadRestrictions::ScopedAllowIO allow_io;
    print_backend->EnumeratePrinters(&printers);
  }
  return printers;
}
v8::Local<v8::Promise> WebContents::PrintToPDF(base::DictionaryValue settings) {
  v8::Isolate* isolate = JavascriptEnvironment::GetIsolate();
  gin_helper::Promise<v8::Local<v8::Value>> promise(isolate);
  v8::Local<v8::Promise> handle = promise.GetHandle();
  PrintPreviewMessageHandler::FromWebContents(ontents())
      ->PrintToPDF(std::move(settings), std::move(promise));
  return handle;
}
#endif
void WebContents::AddWorkSpace(gin::Arguments* args,
                               const base::FilePath& path) {
  if (path.empty()) {
    gin_helper::ErrorThrower(args->isolate())
        .ThrowError("path cannot be empty");
    return;
  }
  DevToolsAddFileSystem(std::string(), path);
}
void WebContents::RemoveWorkSpace(gin::Arguments* args,