Remove uses of unittest in the HTML tests where possible.

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

Index: pkg/dev_compiler/test/codegen/lib/html/uri_test.dart
diff --git a/pkg/dev_compiler/test/codegen/lib/html/uri_test.dart b/pkg/dev_compiler/test/codegen/lib/html/uri_test.dart
index 9079884934d5b91fd1dd7e3d3f55b06cf950a7d7..32ec8659f239e9d98bf7e73ec3ca76477842be52 100644
--- a/pkg/dev_compiler/test/codegen/lib/html/uri_test.dart
+++ b/pkg/dev_compiler/test/codegen/lib/html/uri_test.dart
@@ -2,13 +2,11 @@
 // 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.
 
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
 import 'dart:html';
 
-main() {
-  useHtmlConfiguration();
+import 'package:expect/minitest.dart';
 
+main() {
   test('Uri.base', () {
     expect(Uri.base.scheme, "http");
     expect(Uri.base.toString(), window.location.href);