Mark external/wpt/cookies/http-state/path-tests.htm as slow test

This patch markes external/wpt/cookies/http-state/path-tests.htm as slow test.

Bug: 1028488
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Tbr: yosin@chromium.org
Change-Id: I56e99d2a237ef4038a9ec32b971eba1aae54f5e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1935577
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719025}

cookies/http-state/path-tests.html

@@ -4,6 +4,7 @@
     <meta charset=utf-8>
     <title>Tests basic cookie setting functionality</title>
     <meta name=help href="https://tools.ietf.org/html/rfc6265#page-8">
+    <meta name="timeout" content="long">
 
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>