Delete old tests that aren't used and/or useful any more.

tests/benchmark_smoke/benchmark_smoke_test.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-library benchmarksmoketest;
-
-// Tests that benchmark classes used in perf testing are not broken.
-import 'benchmark_lib.dart';
-import 'dart:async';
-import 'dart:html';
-import 'package:expect/expect.dart';
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
-
-void main() {
-  useHtmlConfiguration();
-
-  test('performanceTesting', () {
-    Timer.run(BENCHMARK_SUITE.runBenchmarks);
-    Timer.run(expectAsync(testForCompletion));
-  });
-}
-
-testForCompletion() {
-  Element element = document.query('#testResultScore');
-  RegExp re = new RegExp('Score: [0-9]+');
-  print(element.text);
-  Expect.isTrue(re.hasMatch(element.text));
-}