Remove uses of unittest in the HTML tests where possible.

pkg/dev_compiler/test/codegen/lib/html/node_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 NodeTest;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_individual_config.dart';
 import 'dart:html';
 import 'dart:svg' as svg;
 
+import 'package:expect/minitest.dart';
+
 Node makeNode() => new Element.tag('div');
-Node makeNodeWithChildren() =>
+Element makeNodeWithChildren() =>
   new Element.html("<div>Foo<br/><!--baz--></div>");
 
 void testUnsupported(String name, void f()) {
   test(name, () {
     expect(f, throwsUnsupportedError);
   });
 }
 
 main() {
-  useHtmlIndividualConfiguration();
-
   var isText = predicate((x) => x is Text, 'is a Text');
   var isComment = predicate((x) => x is Comment, 'is a Comment');
   var isBRElement = predicate((x) => x is BRElement, 'is a BRElement');
   var isHRElement = predicate((x) => x is HRElement, 'is a HRElement');
   var isNodeList = predicate((x) => x is List<Node>, 'is a List<Node>');
   var isImageElement =
       predicate((x) => x is ImageElement, 'is an ImageElement');
   var isInputElement =
       predicate((x) => x is InputElement, 'is an InputElement');
 
@@ skipping 317 matching lines @@
     });
 
     test('TreeWalker', () {
       var root = makeNodeWithChildren();
       var treeWalker = new TreeWalker(root, NodeFilter.SHOW_COMMENT);
       expect(treeWalker.nextNode(), isComment);
       expect(treeWalker.nextNode(), isNull);
     });
   });
 }