Update utils to new library syntax.

utils/tests/string_encoding/utf16_test.dart

Index: utils/tests/string_encoding/utf16_test.dart
===================================================================
--- utils/tests/string_encoding/utf16_test.dart	(revision 14646)
+++ utils/tests/string_encoding/utf16_test.dart	(working copy)
@@ -3,10 +3,10 @@
 // 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("utf16_tests");
-#import("dunit.dart");
-#import("../../string_encoding/unicode_core.dart");
-#import("../../string_encoding/utf16.dart");
+library utf16_tests;
+import 'dunit.dart';
+import '../../string_encoding/unicode_core.dart';
+import '../../string_encoding/utf16.dart';
 
 void main() {
   TestSuite suite = new TestSuite();