Revert "compositor: Create a single cross-process compositor API (#33619)" (#33645)

This reverts commit f2f5614ad6.

This is causing intermittent crashes: https://github.com/servo/servo/actions/runs/11167043809/job/31044255019

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

ports/servoshell/desktop/headless_window.rs

@@ -167,9 +167,9 @@ impl WindowMethods for Window {
         EmbedderCoordinates {
             viewport,
             framebuffer: size,
-            window_rect: DeviceIntRect::from_origin_and_size(Point2D::zero(), size),
-            screen_size: size,
-            available_screen_size: size,
+            window: (size, Point2D::zero()),
+            screen: size,
+            screen_avail: size,
             hidpi_factor: dpr,
         }
     }