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

sky/tests/layout/document-elementFromPoint.sky

-<sky>
-<style>
-foo, parent { width: 100px; height: 100px; background: blue; }
-bar { width: 100px; height: 100px; background: purple; }
-parent { display: paragraph; }
-child { background: salmon; display: paragraph; }
-canvas { height: 50px; background-color: pink; }
-inline-flex { display: inline-flex; width: 50px; height: 50px; background: green; }
-grand-child { width: 50px; height: 50px; transform: translate3d(100px, 0, 0); background: papayawhip; }
-</style>
-<foo /><bar />
-<parent>
-  <child>Foo bar</child>
-  <inline-flex>
-    <grand-child />
-  </inline-flex>
-</parent>
-<canvas />
-<script>
-import "../resources/third_party/unittest/unittest.dart";
-import "../resources/unit.dart";
-
-import "dart:sky";
-
-void main() {
-  initUnit();
-
-  test("should hit test", () {
-    // FIXME: We should have much better hit-testing coverage, at least:
-    // inline content (both sections of a wrapped run)
-    // text node
-    // flex box
-    // display: paragraph
-    // position: absolute
-    // position: relative
-    // z-order (missing, zero, positive and negative)
-    expect(document.elementFromPoint(50, 50).tagName, equals('foo'));
-    expect(document.elementFromPoint(50, 150).tagName, equals('bar'));
-    expect(document.elementFromPoint(150, 50).tagName, equals('sky'));
-  });
-
-  void hitTestWithChildren() {
-    expect(document.elementFromPoint(50, 210).tagName, equals('child'));
-    // Right of the <child> inline.
-    expect(document.elementFromPoint(95, 210).tagName, equals('parent'));
-    // Below the <child> inline.
-    expect(document.elementFromPoint(50, 275).tagName, equals('parent'));
-  }
-
-  test("should hit test child and parent", () {
-    hitTestWithChildren();
-  });
-
-  test("should hit test child with layered parent", () {
-    document.querySelector('parent').style["transform"] = "translate3d(0, 0, 0)";
-    hitTestWithChildren();
-  });
-
-  test("should hit test transformed child", () {
-    document.querySelector('parent').style["display"] = "flex";
-    document.querySelector('child').style["transform"] = "translate3d(100px, 0, 0)";
-    expect(document.elementFromPoint(50, 210).tagName, equals('parent'));
-    expect(document.elementFromPoint(150, 210).tagName, equals('child'));
-    expect(document.elementFromPoint(25, 240).tagName, equals('inline-flex'));
-    // TODO(ojan): This is incorrect. It should hit grand-child.
-    // This broke sometime before 4153b8a515d54275934d4244aaf2d5a7a8fe3333.
-    expect(document.elementFromPoint(150, 240).tagName, equals('sky'));
-  });
-
-  test("should hit test canvas", () {
-    expect(document.elementFromPoint(50, 310).tagName, equals('canvas'));
-  });
-}
-</script>
-</sky>