Move unittest from lib to pkg.

tests/utils/dartdoc_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.
 
 /// Unit tests for doc.
 #library('dartdoc_tests');
 
 #import('../../lib/dartdoc/dartdoc.dart', prefix: 'dd');
 #import('../../lib/dartdoc/markdown.dart', prefix: 'md');
 
 // TODO(rnystrom): Better path to unittest.
-#import('../../lib/unittest/unittest.dart');
+#import('../../pkg/unittest/unittest.dart');
 #import('../../frog/lang.dart');
 #import('../../frog/file_system_vm.dart');
 
 main() {
   var files = new VMFileSystem();
   parseOptions('../../frog', [], files);
   initializeWorld(files);
 
   group('countOccurrences', () {
     test('empty text returns 0', () {
@@ skipping 192 matching lines @@
 
     test('to a named constructor', () {
       expect(render(doc.resolveNameReference('new Class.namedConstructor',
                   library: dummy)),
         equals('<a class="crossref" ' +
             'href="../dummy/Class.html#new:Class.namedConstructor">new ' +
             'Class.namedConstructor</a>'));
     });
   });
 }