Remove library dart:crypto

sdk/lib/_internal/pub/lib/src/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;
 
 import 'dart:async';
-import 'dart:crypto';
 import 'dart:io';
 import 'dart:isolate';
 import 'dart:json' as json;
 import 'dart:mirrors';
 
+import "package:crypto/crypto.dart";
 import 'package:pathos/path.dart' as path;
 
 /// A pair of values.
 class Pair<E, F> {
   E first;
   F last;
 
   Pair(this.first, this.last);
 
   String toString() => '($first, $last)';
@@ skipping 513 matching lines @@
     error is FileIOException ||
     error is HttpException ||
     error is HttpParserException ||
     error is LinkIOException ||
     error is MimeMultipartException ||
     error is OSError ||
     error is ProcessException ||
     error is SocketIOException ||
     error is WebSocketException;
 }