Remove meta_window_new_with_attrs

The compositor code used to handle X windows that didn't have a
corresponding MetaWindow (see commit d538690b), which is why the
attribute query is separated.

As that doesn't happen any more, we can clean up. No functional changes.

Suggested by Owen Taylor.

https://bugzilla.gnome.org/show_bug.cgi?id=721345

src/core/display.c

@@ -2806,14 +2806,14 @@ handle_other_xevent (MetaDisplay *display,
           && meta_display_screen_for_root (display, event->xmap.event))
         {
           window = meta_window_new (display, event->xmap.window,
-                                    FALSE);
+                                    FALSE, META_COMP_EFFECT_CREATE);
         }
       break;
     case MapRequest:
       if (window == NULL)
         {
           window = meta_window_new (display, event->xmaprequest.window,
-                                    FALSE);
+                                    FALSE, META_COMP_EFFECT_CREATE);
         }
       /* if frame was receiver it's some malicious send event or something */
       else if (!frame_was_receiver && window)