dom.w3c_pointer_events.dispatch_click_as_pointer_event
Keep supporting the pref makes a lot of `click`, `auxclick` and `contextmenu` event creators complicated (and look messy). So, let's delete it as soon as possible. Differential Revision: https://phabricator.services.mozilla.com/D217225
1904014
1675847
ePointerClick
WidgetPointerEvent