Move minitest.dart into the expect package.

pkg/dev_compiler/test/codegen/lib/html/element_types_constructors5_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.
 
 import 'dart:html';
 
-import 'package:minitest/minitest.dart';
+import 'package:expect/minitest.dart';
 
 main() {
   check(String name, bool fn(), [bool supported = true]) {
     test(name, () {
       var expectation = supported ? returnsNormally : throws;
       expect(() {
         expect(fn(), isTrue);
       }, expectation);
     });
   }
 
   group('constructors', () {
     check('table', () => new TableElement() is TableElement);
     check('template', () => new TemplateElement() is TemplateElement,
         TemplateElement.supported);
     check('textarea', () => new TextAreaElement() is TextAreaElement);
     check('title', () => new TitleElement() is TitleElement);
     check('td', () => new TableCellElement() is TableCellElement);
     check('col', () => new TableColElement() is TableColElement);
     check('colgroup', () => new Element.tag('colgroup') is TableColElement);
     check('tr', () => new TableRowElement() is TableRowElement);
     check('tbody', () => new Element.tag('tbody') is TableSectionElement);
     check('tfoot', () => new Element.tag('tfoot') is TableSectionElement);
     check('thead', () => new Element.tag('thead') is TableSectionElement);
     check('track', () => new TrackElement() is TrackElement,
         TrackElement.supported);
   });
 }