code: function unregisterAll(win) {
  	debug(`Unregistering all shortcuts on window ${title(win)}`);
  	const wc = win.webContents;
  	const shortcutsOfWindow = windowsWithShortcuts.get(wc);
  
  	// Remove listener from window
  	shortcutsOfWindow.removeListener();
  
  	windowsWithShortcuts.delete(wc);
  }
docs: Unregisters all of the shortcuts registered on any focused BrowserWindow
  instance. This method does not unregister any shortcut you registered on
  a particular window instance.
  @param  {BrowserWindow} win BrowserWindow instance
  @return {Undefined}