Update unittest to new package layout.

pkg/intl/test/number_format_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('number_format_test');
 
-#import('../../../pkg/unittest/unittest.dart');
+// TODO(rnystrom): Use "package:" URL (#4968).
+#import('../../../pkg/unittest/lib/unittest.dart');
 #import('../number_format.dart');
 #import('../intl.dart');
 
 /**
  * Tests the Numeric formatting library in dart.
  */
 var testNumbers = const {
   "0.001":  0.001,
   "0.01": 0.01,
   "0.1": 0.1,
@@ skipping 20 matching lines @@
   });
 
   test('Simple set of numbers', () {
     var number = new NumberFormat();
     for (var x in testNumbers.getKeys()) {
       var formatted = number.format(testNumbers[x]);
       expect(formatted, x);
     }
   });
 }