Remove obsolete version of dromaeo

lib/html/benchmarks/dromaeo/tests/DomTraverse.dart

-class Main {
-  static void main() {
-    final int num = 40;
-
-    // Try to force real results.
-    var ret;
-    window.on.load.add((Event evt) {
-      String html = document.body.innerHTML;
-
-      new Suite('dom-traverse')
-        .prep(() {
-          html = BenchUtil.replaceAll(html, 'id="test(\\w).*?"', (Match match) {
-            final group = match.group(1);
-            return 'id="test${group}${num}"';
-          });
-          html = BenchUtil.replaceAll(html, 'name="test.*?"', (Match match) {
-            return 'name="test${num}"';
-          });
-          html = BenchUtil.replaceAll(html, 'class="foo.*?"', (Match match) {
-            return 'class="foo test${num} bar"';
-          });
-
-          final div = new Element.tag('div');
-          div.innerHTML = html;
-          document.body.nodes.add(div);
-        })
-        .test('firstChild', () {
-          final nodes = document.body.nodes;
-          final nl = nodes.length;
-
-          for (int i = 0; i < num; i++) {
-            for (int j = 0; j < nl; j++) {
-              Node cur = nodes[j];
-              while (cur !== null) {
-                cur = cur.nodes.first;
-              }
-              ret = cur;
-            }
-          }
-        })
-        .test('lastChild', () {
-          final nodes = document.body.nodes;
-          final nl = nodes.length;
-
-          for (int i = 0; i < num; i++) {
-            for (int j = 0; j < nl; j++) {
-              Node cur = nodes[j];
-              while (cur !== null) {
-                cur = cur.nodes.last();
-              }
-              ret = cur;
-            }
-          }
-        })
-        .test('nextSibling', () {
-          for (int i = 0; i < num * 2; i++) {
-            Node cur = document.body.nodes.first;
-            while (cur !== null) {
-              cur = cur.nextNode;
-            }
-            ret = cur;
-          }
-        })
-        .test('previousSibling', () {
-          for (int i = 0; i < num * 2; i++) {
-            Node cur = document.body.nodes.first;
-            while (cur !== null) {
-              cur = cur.previousNode;
-            }
-            ret = cur;
-          }
-        })
-        .test('childNodes', () {
-          for (int i = 0; i < num; i++) {
-            final nodes = document.body.nodes;
-            for (int j = 0; j < nodes.length; j++) {
-              ret = nodes[j];
-            }
-          }
-        })
-        .end();
-    });
-  }
-}