Update utils to new library syntax.

utils/archive/utils.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("utils");
+library utils;
 
-#import("dart-ext:dart_archive");
-#import("dart:isolate");
-#import("archive.dart", prefix: "archive");
+import 'dart-ext:dart_archive';
+import 'dart:isolate';
+import 'archive.dart' as archive;
 
 /** The cache of the port used to communicate with the C extension. */
 SendPort _port;
 
 /** The port used to communicate with the C extension. */
 SendPort get servicePort {
   if (_port == null) _port = _newServicePort();
   return _port;
 }
 
@@ skipping 83 matching lines @@
   /** The error code for the error, or null. */
   final int errno;
 
   ArchiveException(this.message, [this.errno]);
 
   String toString() {
     if (errno == null) return "Archive error: $message";
     return "Archive error $errno: $message";
   }
 }