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### Preflight Checklist
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* [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 for a feature request that matches the one I want to file, without success.

### Problem Description
<!-- Is your feature request related to a problem? Please add a clear and concise description of what the problem is. -->

They is no way to choose the paper format (A4, A3, Letter, ...) when printing with `webContents.print()`.

### Proposed Solution
<!-- Describe the solution you'd like in a clear and concise manner -->

Add something like the `pageSize` option which is available in [`webContents.printToPDF()`](https://electronjs.org/docs/api/web-contents#contentsprinttopdfoptions-callback).

shell/browser/api/electron_api_web_contents.cc
bool proceed,
                                    bool* proceed_to_fire_unload) {
  if (type_ == Type::BROWSER_WINDOW || type_ == Type::OFF_SCREEN)
    *proceed_to_fire_unload = proceed;
  else
    *proceed_to_fire_unload = true;
}
void Ws::SetContentsBounds(content::Ws* source,
                                    const gfx::Rect& pos) {
  Emit("move", pos);
}
void Ws::CloseContents(content::Ws* source) {
  Emit("close");
  auto* autofill_driver_factory =
      AutofillDriverFactory::FromWs(ontents());
  if (autofill_driver_factory) {
    autofill_driver_factory->CloseAllPopups();
  }
  if (managed_ontents())
    managed_ontents()->GetView()->SetDelegate(nullptr);
  for (ExtendedWsObserver& observer : observers_)
    observer.OnCloseContents();
}
void Ws::ActivateContents(content::Ws* source) {