Fix standalone/io/platform_test on Windows. Remove @deprecated from Platform.

tests/standalone/io/platform_test.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:async";
 import "dart:io";
 import "dart:isolate";
 
 import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
@@ skipping 30 matching lines @@
               "Platform.executableArguments": Platform.executableArguments});
 }
 
 testIsolate() {
   asyncStart();
   ReceivePort port = new ReceivePort();
   var remote = Isolate.spawn(f, port.sendPort);
   port.first.then((results) {
     Expect.equals(Platform.executable, results["Platform.executable"]);
 
-    Uri uri = Uri.parse(results["Platform.script"]);
+    Uri uri = Uri.file(results["Platform.script"]);
     // SpawnFunction retains the script url of the parent which in this
     // case was a relative path.
     Expect.equals("", uri.scheme);
     Expect.isTrue(uri.path.endsWith('tests/standalone/io/platform_test.dart'));
     Expect.equals(Platform.packageRoot, results["Platform.packageRoot"]);
     Expect.listEquals(Platform.executableArguments,
                       results["Platform.executableArguments"]);
     asyncEnd();
   });
 }
 
 main() {
   test();
   testIsolate();
 }