Refactor NativeWindow (Part 6): Move NativeWindow bindings to api::TopLevelWindow (#12596)

* Add atom::api::TopLevelWindow

* Make BrowserWindow inherit TopLevelWindow

* Fix reading from wrong weak map

* Read options after setting content view

* OnWindowClosed is not guarenteed to run now

* Fix the offscreen hack in BrowserWindow

* Fix building on Linux

* Fix tests on Linux

* Fix building on Windows

atom/browser/api/atom_api_menu_mac.mm

@@ -35,7 +35,8 @@ void MenuMac::PopupAt(BrowserWindow* window,
     return;
 
   auto popup = base::Bind(&MenuMac::PopupOnUI, weak_factory_.GetWeakPtr(),
-                          native_window->GetWeakPtr(), window->ID(), x, y,
+                          native_window->GetWeakPtr(),
+                          window->weak_map_id(), x, y,
                           positioning_item, callback);
   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, popup);
 }