Move unittest from lib to pkg.

tests/html/queryall_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('NodeListTest');
-#import('../../lib/unittest/unittest.dart');
-#import('../../lib/unittest/html_config.dart');
+#import('../../pkg/unittest/unittest.dart');
+#import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 
 main() {
   useHtmlConfiguration();
 
   var div = new DivElement();
   div.id = 'test';
   document.body.nodes.add(div);
 
   div.nodes.addAll([
@@ skipping 48 matching lines @@
       expect(list[4] is CanvasElement, isTrue);
     });
 
   test('immutable', () {
       List<Element> list = div.queryAll('*');
       int len = list.length;
       expect(() { list.add(new DivElement()); }, throwsException);
       expect(list.length, equals(len));
     });
 }