Move minitest.dart into the expect package.

pkg/dev_compiler/test/codegen/lib/html/blob_constructor_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 'dart:typed_data';
 
-import 'package:minitest/minitest.dart';
+import 'package:expect/minitest.dart';
 
 main() {
   test('basic', () {
       var b = new Blob([]);
       expect(b.size, 0);
     });
 
   test('type1', () {
       // OPTIONALS var b = new Blob(['Harry'], type: 'text');
       var b = new Blob(['Harry'], 'text');
@@ skipping 32 matching lines @@
       expect(b1.size, 1);
       expect(b2.size, 2);
     });
 
   test('fromArrayBuffer', () {
       var a = new Uint8List(100).buffer; // i.e. new ArrayBuffer(100);
       var b = new Blob([a, a]);
       expect(b.size, 200);
     });
 }