Remove uses of unittest in the HTML tests where possible.

pkg/dev_compiler/test/codegen/lib/html/table_test.dart

 // Copyright (c) 2012, 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 TableTest;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
 import 'dart:html';
 
+import 'package:expect/minitest.dart';
+
 main() {
-  useHtmlConfiguration();
-
   test('createTBody', () {
     var table = new TableElement();
     var head = table.createTHead();
     expect(table.tHead, head);
 
     var headerRow =  head.addRow();
     var headerCell = headerRow.addCell();
     headerCell.text = 'Header Cell';
 
     var caption = table.createCaption();
@@ skipping 29 matching lines @@
     var bodyCell2 = bodyRow2.addCell();
     bodyCell2.text = 'Body Cell2';
 
     expect(body2.rows.length, 1);
 
     expect(table.tBodies.length, 2);
     expect(table.tBodies[1], body2);
   });
 }