Remove uses of unittest in the HTML tests where possible.

pkg/dev_compiler/test/codegen/lib/html/typed_arrays_arraybuffer_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 typed_arrays_arraybuffer_test;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
 import 'dart:html';
 import 'dart:typed_data';
 
+import 'package:expect/minitest.dart';
+
 main() {
-  useHtmlConfiguration();
-
   // Only perform tests if ArrayBuffer is supported.
   if (!Platform.supportsTypedData) {
     return;
   }
 
   test('constructor', () {
       var a = new Int8List(100);
       expect(a.lengthInBytes, 100);
   });
 
@@ skipping 11 matching lines @@
   test('sublist3', () {
       var a = new Int8List(100);
       expect(() => a.sublist(50, 10), throwsRangeError);
   });
 
   test('sublist4', () {
       var a = new Int8List(100);
       expect(() => a.sublist(-90, -30), throwsRangeError);
   });
 }