Make temp directory start with dart_ in file_stream test. Fix DOS line endings.

tests/standalone/io/file_stream_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.
 
 import "dart:async";
 import "dart:io";
 
 import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
 
 void testPauseResumeCancelStream() {
   asyncStart();
-  Directory.systemTemp.createTemp('file_stream').then((d) {
+  Directory.systemTemp.createTemp('dart_file_stream').then((d) {
     var file = new File("${d.path}/file");
     new File(Platform.executable).openRead().pipe(file.openWrite())
       .then((_) {
         var subscription;
         subscription = file.openRead().listen((data) {
           subscription.pause();
           subscription.resume();
           void close() {
             d.deleteSync(recursive: true);
             asyncEnd();
           }
           var future = subscription.cancel();
           if (future != null) {
             future.whenComplete(close);
           } else {
             close();
           }
         }, onDone: () {
           Expect.fail('the stream was canceled, onDone should not happend');
         });
       });
   });
 }
 
 void testStreamIsEmpty() {
   asyncStart();
-  Directory.systemTemp.createTemp('file_stream').then((d) {
+  Directory.systemTemp.createTemp('dart_file_stream').then((d) {
     var file = new File("${d.path}/file");
     new File(Platform.executable).openRead().pipe(file.openWrite())
       .then((_) {
         // isEmpty will cancel the stream after first data event.
         file.openRead().isEmpty.then((empty) {
           Expect.isFalse(empty);
           d.deleteSync(recursive: true);
           asyncEnd();
         });
       });
   });
 }
 
 void main() {
   testPauseResumeCancelStream();
   testStreamIsEmpty();
 }