Work around dart-lang/sdk#25353.

lib/src/io.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.
 
 /// Helper functionality to make working with IO easier.
 library pub.io;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
@@ skipping 329 matching lines @@
 
   getErrorReason(error) {
     if (error.osError.errorCode == 5) {
       return "access was denied";
     }
 
     if (error.osError.errorCode == 32) {
       return "it was in use by another process";
     }
 
+    if (error.osError.errorCode == 145) {
+      return "of dart-lang/sdk#25353";
+    }
+
     return null;
   }
 
   for (var i = 0; i < 2; i++) {
     try {
       operation();
       return;
     } on FileSystemException catch (error) {
       var reason = getErrorReason(error);
       if (reason == null) rethrow;
@@ skipping 701 matching lines @@
 
   // TODO(rnystrom): Remove this and change to returning one string.
   static List<String> _toLines(String output) {
     var lines = splitLines(output);
     if (!lines.isEmpty && lines.last == "") lines.removeLast();
     return lines;
   }
 
   bool get success => exitCode == exit_codes.SUCCESS;
 }