Remove Sky tests that we don't intend to port to the new world

sky/tests/layout/position-absolute-pixels-expected.sky

Index: sky/tests/layout/position-absolute-pixels-expected.sky
diff --git a/sky/tests/layout/position-absolute-pixels-expected.sky b/sky/tests/layout/position-absolute-pixels-expected.sky
deleted file mode 100644
index 27a2db613427a3807a256b82a8e3f3af663b8adb..0000000000000000000000000000000000000000
--- a/sky/tests/layout/position-absolute-pixels-expected.sky
+++ /dev/null
@@ -1,18 +0,0 @@
-<sky>
-  <import src="../resources/run-after-display.sky"/>
-
-  <img src="http://storage.googleapis.com/mojo/sky-pngs/0e49314437b063e76c28511c34a6c6da72c17956" />
-
-  <script>
-  import "dart:sky";
-  import "dart:sky.internals" as internals;
-
-  void main() {
-    window.addEventListener("load", (_) {
-      runAfterDisplay(() {
-        internals.notifyTestComplete("");
-      });
-    });
-  }
-  </script>
-</sky>