Skip bad cookies in http headers.

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.
 
 library dart.io;
 
 import "package:expect/expect.dart";
 import "dart:async";
 import "dart:collection";
 import "dart:convert";
@@ skipping 418 matching lines @@
   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"));
+
+  _HttpHeaders headers = new _HttpHeaders("1.1");
+  headers.set('Cookie',
+              'DARTSESSID=d3d6fdd78d51aaaf2924c32e991f4349; undefined');
+  Expect.equals('DARTSESSID', headers._parseCookies().single.name);
+  Expect.equals('d3d6fdd78d51aaaf2924c32e991f4349',
+                headers._parseCookies().single.value);
 }
 
 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();
 }