pkg/analyzer: support latest pkg/crypto version

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:io';
 import 'dart:isolate';
 import 'dart:convert';
@@ skipping 24 matching lines @@
           password = request.uri.path.substring(1, 6);
         }
         if (passwordChanged) password = "${password}1";
         if (request.headers[HttpHeaders.AUTHORIZATION] != null) {
           Expect.equals(1, request.headers[HttpHeaders.AUTHORIZATION].length);
           String authorization =
             request.headers[HttpHeaders.AUTHORIZATION][0];
           List<String> tokens = authorization.split(" ");
           Expect.equals("Basic", tokens[0]);
           String auth =
-              CryptoUtils.bytesToBase64(UTF8.encode("$username:$password"));
+              BASE64.encode(UTF8.encode("$username:$password"));
           if (passwordChanged && auth != tokens[1]) {
             response.statusCode = HttpStatus.UNAUTHORIZED;
             response.headers.set(HttpHeaders.WWW_AUTHENTICATE,
                                  "Basic, realm=realm");
           } else {
             Expect.equals(auth, tokens[1]);
           }
         } else {
           response.statusCode = HttpStatus.UNAUTHORIZED;
           response.headers.set(HttpHeaders.WWW_AUTHENTICATE,
@@ skipping 203 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();
 }