Fix reported test-tidy errors for unmerged import blocks

This merges import blocks that were reported by tidy as unmerged.

components/compositing/windowing.rs

@@ -5,7 +5,6 @@
 //! Abstract windowing methods. The concrete implementations of these can be found in `platform/`.
 
 use compositor_task::{CompositorProxy, CompositorReceiver};
-
 use euclid::point::TypedPoint2D;
 use euclid::scale_factor::ScaleFactor;
 use euclid::size::TypedSize2D;