Move minitest.dart into the expect package.

pkg/dev_compiler/test/codegen/lib/html/element_types_constructors4_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('p', () => new ParagraphElement() is ParagraphElement);
     check('param', () => new ParamElement() is ParamElement);
     check('pre', () => new PreElement() is PreElement);
     check('progress', () => new ProgressElement() is ProgressElement,
         ProgressElement.supported);
     check('q', () => new QuoteElement() is QuoteElement);
     check('script', () => new ScriptElement() is ScriptElement);
     check('select', () => new SelectElement() is SelectElement);
     check('shadow',
         () => new ShadowElement() is ShadowElement, ShadowElement.supported);
     check('source', () => new SourceElement() is SourceElement);
     check('span', () => new SpanElement() is SpanElement);
     check('style', () => new StyleElement() is StyleElement);
   });
 }