Update utils to new library syntax.

utils/tests/string_encoding/dunit.dart

 #!/usr/bin/env 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("dunit");
+library dunit;
 
 typedef void Test();
 typedef TestResult SynchTest();
 typedef Future<TestResult> AsynchTest();
 
 class TestSuite {
   TestSuite() : _tests = <SynchTest>[];
 
   void registerTestClass(TestClass tests) {
     tests.registerTests(this);
@@ skipping 93 matching lines @@
         tearDown();
         return new TestError(description, x, stacktrace);
       }
     });
   }
 
   abstract void registerTests(TestSuite suite);
   void setUp() {}
   void tearDown() {}
 }