These events are emitted for every navigation request which isn't really efficient. Also upstream has removed the observers that provide these details as part of network servification https://chromium-review.googlesource.com/c/chromium/src/+/805008 and https://chromium-review.googlesource.com/c/chromium/src/+/786320. We are removing it as a part of chromium 66 upgrade.

Proposed alternative: Users can use the [webRequest](https://github.com/electron/electron/blob/master/docs/api/web-request.md) module which provides similar navigation details on a subscription basis.
atom/browser/api/atom_api_web_contents.cc
bool proceed,
                                    bool* proceed_to_fire_unload) {
  if (type_ == BROWSER_WINDOW || type_ == OFF_SCREEN)
    *proceed_to_fire_unload = proceed;
  else
    *proceed_to_fire_unload = true;
}
void WebContents::MoveContents(content::WebContents* source,
                               const gfx::Rect& pos) {
  Emit("move", pos);
}
void WebContents::CloseContents(content::WebContents* source) {
  Emit("close");
#if defined(TOOLKIT_VIEWS)
  HideAutofillPopup();
#endif
  if (managed_web_contents())
    managed_web_contents()->GetView()->SetDelegate(nullptr);
  for (ExtendedWebContentsObserver& observer : observers_)
    observer.OnCloseContents();
}
void WebContents::ActivateContents(content::WebContents* source) {