Gets the user data of menu.
This function can be used from the UI Process to get user data previously set from the Web Process with webkitwebprocessextension.context_menu.ContextMenu.setUserData.
the user data of menu, or null if menu doesn't have user data
Gets the user data of menu.
This function can be used from the UI Process to get user data previously set from the Web Process with webkitwebprocessextension.context_menu.ContextMenu.setUserData.