Change dart:io Platform.script to return a URI. Change all uses of Platform.script to work with th…

tests/standalone/typed_data_isolate_test.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.
 //
 // Dart test program for testing typed data.
 
 // Library tag to be able to run in html test framework.
 library TypedDataIsolateTest;
 
 import 'dart:io';
 import 'dart:isolate';
 import 'package:async_helper/async_helper.dart';
 
 second(message) {
   var data = message[0];
   var replyTo = message[1];
   print('got data');
   print(data);
   print('printed data');
   replyTo.send('OK');
 }
 
 main() {
  asyncStart();
- new File(Platform.script).readAsBytes().then((List<int> data) {
+ new File(Platform.script.toFilePath()).readAsBytes().then((List<int> data) {
    var response = new ReceivePort();
    var remote = Isolate.spawn(second, [data, response.sendPort]);
    response.first.then((reply) {
      print('got reply');
      asyncEnd();
    });
  });
 }