Remove uses of unittest in the HTML tests where possible.

pkg/dev_compiler/test/codegen/lib/html/typed_arrays_simd_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 TypedArraysSimdTest;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
 import 'dart:html';
 import 'dart:typed_data';
 
+import 'package:expect/minitest.dart';
+
 const _FLOATING_POINT_ERROR = 0.0000000001;
 floatEquals(value) => closeTo(value, _FLOATING_POINT_ERROR);
 
 class MyFloat32x4 {
   num x = 0.0;
   num y = 0.0;
   num z = 0.0;
   num w = 0.0;
 }
 
 main() {
-  useHtmlConfiguration();
-
   // Only perform tests if ArrayBuffer is supported.
   if (!Platform.supportsTypedData) {
     return;
   }
 
   test('test Float32x4', () {
       if (Platform.supportsSimd) {
         final val = new Float32x4(1.0, 2.0, 3.0, 4.0);
         expect(val.x, floatEquals(1.0));
         expect(val.y, floatEquals(2.0));
@@ skipping 42 matching lines @@
         expect(val.z, equals(3));
         expect(val.w, equals(4));
         final val2 = val ^ val;
         expect(val2.x, equals(0));
         expect(val2.y, equals(0));
         expect(val2.z, equals(0));
         expect(val2.w, equals(0));
       }
   });
 }