Simplify accelerated paint and remove windows CanvasSkiaPaint

ui/views/widget/widget.cc

Index: ui/views/widget/widget.cc
diff --git a/ui/views/widget/widget.cc b/ui/views/widget/widget.cc
index 64e131e45617b7473dd5417771dd3f5e70884a5e..b4d2a484233ab797a8ba48fc2c6a00edde22ebd0 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -1172,15 +1172,6 @@ bool Widget::HasFocusManager() const {
   return !!focus_manager_.get();
 }
 
-bool Widget::OnNativeWidgetPaintAccelerated(const gfx::Rect& dirty_region) {
-  ui::Compositor* compositor = GetCompositor();
-  if (!compositor)
-    return false;
-
-  compositor->ScheduleRedrawRect(dirty_region);
-  return true;
-}
-
 void Widget::OnNativeWidgetPaint(const ui::PaintContext& context) {
   // On Linux Aura, we can get here during Init() because of the
   // SetInitialBounds call.