Use correct newline-token on windows, in pub.

utils/pub/io.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.
 
 /**
  * Helper functionality to make working with IO easier.
  */
 library io;
 
 import 'dart:io';
 import 'dart:isolate';
 import 'dart:uri';
 
 import 'utils.dart';
 
 bool _isGitInstalledCache;
 
 /// The cached Git command.
 String _gitCommandCache;
 
 /** Gets the current working directory. */
 String get workingDir => new File('.').fullPathSync();
 
+const Pattern NEWLINE_PATTERN = const RegExp("\r\n?|\n\r?");
+
 /**
  * Prints the given string to `stderr` on its own line.
  */
 void printError(value) {
   stderr.writeString(value.toString());
   stderr.writeString('\n');
 }
 
 /**
  * Joins a number of path string parts into a single path. Handles
@@ skipping 462 matching lines @@
   final options = new ProcessOptions();
   if (workingDir != null) {
     options.workingDirectory = _getDirectory(workingDir).path;
   }
   options.environment = environment;
 
   var future = Process.run(executable, args, options);
   return future.transform((result) {
     // TODO(rnystrom): Remove this and change to returning one string.
     List<String> toLines(String output) {
-      var lines = output.split("\n");
+      var lines = output.split(NEWLINE_PATTERN);
       if (!lines.isEmpty() && lines.last() == "") lines.removeLast();
       return lines;
     }
     return new PubProcessResult(toLines(result.stdout),
                                 toLines(result.stderr),
                                 result.exitCode);
   });
 }
 
 /**
@@ skipping 236 matching lines @@
   return new Directory(entry);
 }
 
 /**
  * Gets a [Uri] for [uri], which can either already be one, or be a [String].
  */
 Uri _getUri(uri) {
   if (uri is Uri) return uri;
   return new Uri.fromString(uri);
 }