Remove library dart:crypto

tests/standalone/io/http_auth_test.dart

 // Copyright (c) 2013, 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.
 
+import "package:crypto/crypto.dart";
 import "package:expect/expect.dart";
 import 'dart:async';
-import 'dart:crypto';
 import 'dart:io';
 import 'dart:isolate';
 import 'dart:utf';
 
 class Server {
   HttpServer server;
   bool passwordChanged = false;
 
   Future<Server> start() {
     var completer = new Completer();
@@ skipping 241 matching lines @@
 main() {
   testUrlUserInfo();
   testBasicNoCredentials();
   testBasicCredentials();
   testBasicAuthenticateCallback();
   // These teste are not normally run. They can be used for locally
   // testing with another web server (e.g. Apache).
   //testLocalServerBasic();
   //testLocalServerDigest();
 }