Add long timeout to external/wpt/cookies/http-state/attribute-tests.html

Bug: 1061664
Change-Id: I577aedb7e78d5ad2b8359254f8af1fc384410f4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107439
Commit-Queue: Lily Chen <chlily@chromium.org>
Commit-Queue: Maksim Orlovich <morlovich@chromium.org>
Auto-Submit: Lily Chen <chlily@chromium.org>
Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751061}

third_party/blink/web_tests/external/wpt/cookies/http-state/attribute-tests.html

@@ -4,6 +4,7 @@
     <meta charset=utf-8>
     <title>Tests cookie attribute 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>