Replace some Point2D::new(0, 0) instances with Point2D::zero() (#33783)

Signed-off-by: hackerbirds <120066692+hackerbirds@users.noreply.github.com>

components/compositing/windowing.rs

@@ -285,7 +285,7 @@ mod test {
 
     #[test]
     fn test() {
-        let pos = Point2D::new(0, 0);
+        let pos = Point2D::zero();
         let viewport = Size2D::new(800, 600);
         let screen = Size2D::new(1080, 720);
         let coordinates = EmbedderCoordinates {

components/script/canvas_state.rs

@@ -612,7 +612,7 @@ impl CanvasState {
         dh: f64,
     ) -> (Rect<f64>, Rect<f64>) {
         let image_rect = Rect::new(
-            Point2D::new(0f64, 0f64),
+            Point2D::zero(),
             Size2D::new(image_size.width, image_size.height),
         );
 

components/script/dom/fakexrdevice.rs

@@ -80,7 +80,7 @@ pub fn view<Eye>(view: &FakeXRViewInit) -> Fallible<MockViewInit<Eye>> {
     let size = Size2D::new(view.resolution.width, view.resolution.height);
     let origin = match view.eye {
         XREye::Right => Point2D::new(size.width, 0),
-        _ => Point2D::new(0, 0),
+        _ => Point2D::zero(),
     };
     let viewport = Rect::new(origin, size);
 

ports/servoshell/desktop/headed_window.rs

@@ -126,8 +126,8 @@ impl Window {
             rendering_context,
             event_queue: RefCell::new(vec![]),
             mouse_down_button: Cell::new(None),
-            mouse_down_point: Cell::new(Point2D::new(0, 0)),
-            mouse_pos: Cell::new(Point2D::new(0, 0)),
+            mouse_down_point: Cell::new(Point2D::zero()),
+            mouse_pos: Cell::new(Point2D::zero()),
             last_pressed: Cell::new(None),
             keys_down: RefCell::new(HashMap::new()),
             animation_state: Cell::new(AnimationState::Idle),