Change quoting in Process implementation on Windows.

tests/standalone/src/io/ProcessCheckArgumentsTest.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.
+
+#import("dart:io");
+#source("ProcessTestUtil.dart");
+
+test(args) {
+  Process process = new Process.start(getDartFileName(), args);
+  // Wait for the process to exit and then check result.
+  process.onExit = (exitCode) {
+    Expect.equals(0, exitCode);
+    process.close();
+  };
+}
+
+main() {
+  // Get the Dart script file which checks arguments.
+  var scriptFile =
+    new File("tests/standalone/src/io/ProcessCheckArgumentsScript.dart");
+  if (!scriptFile.existsSync()) {
+    scriptFile =
+        new File("../tests/standalone/src/io/ProcessCheckArgumentsScript.dart");
+  }
+  test([scriptFile.name, '3', '0', 'a']);
+  test([scriptFile.name, '3', '0', 'a b']);
+  test([scriptFile.name, '3', '0', 'a\tb']);
+  test([scriptFile.name, '3', '1', 'a\tb"']);
+  test([scriptFile.name, '3', '1', 'a"\tb']);
+  test([scriptFile.name, '3', '1', 'a"\t\\\\"b"']);
+  test([scriptFile.name, '4', '0', 'a\tb', 'a']);
+  test([scriptFile.name, '4', '0', 'a\tb', 'a\t\t\t\tb']);
+  test([scriptFile.name, '4', '0', 'a\tb', 'a    b']);
+}
+