Use correct path escape on Windows, for Process.

runtime/bin/process_patch.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.
 
 patch class _WindowsCodePageDecoder {
   /* patch */ static String _decodeBytes(List<int> bytes)
       native "SystemEncodingToString";
 }
 
 
@@ skipping 122 matching lines @@
     return '/bin/sh';
   }
 
   static List<String> _getShellArguments(String executable,
                                          List<String> arguments) {
     List<String> shellArguments = [];
     if (Platform.operatingSystem == 'windows') {
       shellArguments.add('/c');
       shellArguments.add(executable);
       for (var arg in arguments) {
-        arg = arg.replaceAll('"', r'\"');
         shellArguments.add(arg);
       }
     } else {
       var commandLine = new StringBuffer();
       executable = executable.replaceAll("'", "'\"'\"'");
       commandLine.write("'$executable'");
       shellArguments.add("-c");
       for (var arg in arguments) {
         arg = arg.replaceAll("'", "'\"'\"'");
         commandLine.write(" '$arg'");
       }
       shellArguments.add(commandLine.toString());
     }
     return shellArguments;
   }
 
   String _windowsArgumentEscape(String argument) {
     var result = argument;
-    if (argument.contains('\t') || argument.contains(' ')) {
+    if (argument.contains('\t') ||
+        argument.contains(' ') ||
+        argument.contains('"')) {
       // Produce something that the C runtime on Windows will parse
       // back as this string.
 
       // Replace any number of '\' followed by '"' with
       // twice as many '\' followed by '\"'.
       var backslash = '\\'.codeUnitAt(0);
       var sb = new StringBuffer();
       var nextPos = 0;
       var quotePos = argument.indexOf('"', nextPos);
       while (quotePos != -1) {
@@ skipping 207 matching lines @@
   const _ProcessResult(int this.pid,
                        int this.exitCode,
                        String this.stdout,
                        String this.stderr);
 
   final int pid;
   final int exitCode;
   final String stdout;
   final String stderr;
 }