Modify tests to use Directory.systemTemp

tests/standalone/io/http_headers_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 "package:expect/expect.dart";
 import 'dart:async';
 import 'dart:math';
 import 'dart:collection';
 
 part '../../../sdk/lib/io/common.dart';
@@ skipping 396 matching lines @@
   test("ABC", "DEF");
   test("Abc", "Def");
   test("SID", "sJdkjKSJD12343kjKj78");
 }
 
 void testInvalidCookie() {
   Expect.throws(() => new _Cookie.fromSetCookieValue(""));
   Expect.throws(() => new _Cookie.fromSetCookieValue("="));
   Expect.throws(() => new _Cookie.fromSetCookieValue("=xxx"));
   Expect.throws(() => new _Cookie.fromSetCookieValue("xxx"));
-  Expect.throws(() => new _Cookie.fromSetCookieValue("xxx=yyy; expires=12 jan 2013"));
+  Expect.throws(() => new _Cookie.fromSetCookieValue(
+      "xxx=yyy; expires=12 jan 2013"));
 }
 
 void testHeaderLists() {
   HttpHeaders.GENERAL_HEADERS.forEach((x) => null);
   HttpHeaders.ENTITY_HEADERS.forEach((x) => null);
   HttpHeaders.RESPONSE_HEADERS.forEach((x) => null);
   HttpHeaders.REQUEST_HEADERS.forEach((x) => null);
 }
 
 main() {
   testMultiValue();
   testDate();
   testExpires();
   testIfModifiedSince();
   testHost();
   testEnumeration();
   testHeaderValue();
   testContentType();
   testContentTypeCache();
   testCookie();
   testInvalidCookie();
   testHeaderLists();
 }