Update unittest to new package layout.

tests/html/cssstyledeclaration_test.dart

 // Copyright (c) 2011, 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('CSSStyleDeclarationTest');
-#import('../../pkg/unittest/unittest.dart');
-#import('../../pkg/unittest/html_config.dart');
+#import('../../pkg/unittest/lib/unittest.dart');
+#import('../../pkg/unittest/lib/html_config.dart');
 #import('dart:html');
 
 main() {
   useHtmlConfiguration();
 
   createTestStyle() {
     return new CSSStyleDeclaration.css("""
       color: blue;
       width: 2px !important;
     """);
@@ skipping 49 matching lines @@
 
     element.getComputedStyle('').then(expectAsync1(
       (CSSStyleDeclaration style) {
         // Some browsers will normalize this, so it'll be a matrix rather than
         // the original string. Just check that it's something other than null.
         expect(style.transform.length, greaterThan(3));
       }
     ));
   });
 }