Remove uses of unittest in the HTML tests where possible.

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

 // Copyright (c) 2013, 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.
 
 /// This tests HTML validation and sanitization, which is very important
 /// for prevent XSS or other attacks. If you suppress this, or parts of it
 /// please make it a critical bug and bring it to the attention of the
 /// dart:html maintainers.
-library trusted_html_tree_sanitizer_test;
-
+import 'dart:js' as js;
 import 'dart:html';
 import 'dart:svg' as svg;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_individual_config.dart';
+
+import 'package:expect/minitest.dart';
+
 import 'utils.dart';
-import 'dart:js' as js;
 
 var oldAdoptNode;
 var jsDocument;
 
 /// We want to verify that with the trusted sanitizer we are not
 /// creating a document fragment. So make DocumentFragment operation
 /// throw.
 makeDocumentFragmentAdoptionThrow() {
   var document = js.context['document'];
   jsDocument = new js.JsObject.fromBrowserObject(document);
   oldAdoptNode = jsDocument['adoptNode'];
   jsDocument['adoptNode'] = null;
 }
 
 restoreOldAdoptNode() {
   jsDocument['adoptNode'] = oldAdoptNode;
 }
 
 main() {
-  useHtmlIndividualConfiguration();
-
   group('not_create_document_fragment', () {
     setUp(makeDocumentFragmentAdoptionThrow);
     tearDown(restoreOldAdoptNode);
 
     test('setInnerHtml', () {
       document.body.setInnerHtml('<div foo="baz">something</div>',
           treeSanitizer: NodeTreeSanitizer.trusted);
       expect(document.body.innerHtml, '<div foo="baz">something</div>');
     });
 
     test("appendHtml", () {
       var oldStuff = document.body.innerHtml;
       var newStuff = '<div rumplestiltskin="value">content</div>';
       document.body.appendHtml(newStuff,
           treeSanitizer: NodeTreeSanitizer.trusted);
       expect(document.body.innerHtml, oldStuff + newStuff);
     });
   });
 
   group('untrusted', () {
     setUp(makeDocumentFragmentAdoptionThrow);
     tearDown(restoreOldAdoptNode);
     test('untrusted', () {
       expect(() => document.body.innerHtml = "<p>anything</p>", throws);
     });
   });
 }