Delete old raw .sky examples since they are no longer valid examples.

sky/examples/raw/custom_paint_without_element.sky

Index: sky/examples/raw/custom_paint_without_element.sky
diff --git a/sky/examples/raw/custom_paint_without_element.sky b/sky/examples/raw/custom_paint_without_element.sky
deleted file mode 100644
index cf36a2b4ed6086c86e4acbcbfef1472fc13c7843..0000000000000000000000000000000000000000
--- a/sky/examples/raw/custom_paint_without_element.sky
+++ /dev/null
@@ -1,18 +0,0 @@
-<script>
-import "dart:math";
-import 'dart:sky';
-
-void main() {
-  double width = window.innerWidth.toDouble();
-  double height = window.innerHeight.toDouble();
-
-  PictureRecorder recorder = new PictureRecorder(width, height);
-  double radius = min(width, height) * 0.45;
-
-  Paint paint = new Paint()..color = const Color.fromARGB(255, 0, 255, 0);
-
-  recorder.drawCircle(width / 2, height / 2, radius, paint);
-
-  document.rootPicture = recorder.endRecording();
-}
-</script>