perf(skia): Reduce UIElement size and avoid unused property changed registration

src/Uno.UI/UI/Xaml/UIElement.skia.cs

@@ -24,8 +24,6 @@ namespace Windows.UI.Xaml
 	public partial class UIElement : DependencyObject
 	{
 		private ContainerVisual _visual;
-		internal double _canvasTop;
-		internal double _canvasLeft;
 		private Rect _currentFinalRect;
 		private Rect? _currentClippedFrame;
 
@@ -37,8 +35,6 @@ namespace Windows.UI.Xaml
 			InitializePointers();
 			InitializeKeyboard();
 
-			this.RegisterPropertyChangedCallbackStrong(OnPropertyChanged);
-
 			UpdateHitTest();
 		}
 
@@ -59,18 +55,6 @@ namespace Windows.UI.Xaml
 
 		partial void InitializeKeyboard();
 
-		private void OnPropertyChanged(ManagedWeakReference instance, DependencyProperty property, DependencyPropertyChangedEventArgs args)
-		{
-			if (property == Controls.Canvas.TopProperty)
-			{
-				_canvasTop = (double)args.NewValue;
-			}
-			else if (property == Controls.Canvas.LeftProperty)
-			{
-				_canvasLeft = (double)args.NewValue;
-			}
-		}
-
 		partial void OnOpacityChanged(DependencyPropertyChangedEventArgs args)
 		{
 			UpdateOpacity();