Update pub to use new import syntax.

utils/pub/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.
 
 /**
  * Generic utility functions. Stuff that should possibly be in core.
  */
-#library('utils');
+library utils;
 
-#import('dart:crypto');
-#import('dart:isolate');
+import 'dart:crypto';
+import 'dart:isolate';
 
 /** A pair of values. */
 class Pair<E, F> {
   E first;
   F last;
 
   Pair(this.first, this.last);
 
   String toString() => '($first, $last)';
 
@@ skipping 100 matching lines @@
   CryptoUtils.bytesToHex(new SHA1().update(source.charCodes()).digest());
 
 /**
  * Returns a [Future] that completes in [milliSeconds].
  */
 Future sleep(int milliSeconds) {
   var completer = new Completer();
   new Timer(milliSeconds, completer.complete);
   return completer.future;
 }