Mark wpt/cookies/http-state/{general,name}-tests.html slow

Seeing some flakiness due to timeouts in them, and they do look like they
do a lot of things.

Bug: 1047067
Change-Id: I1892f35a8047fdad8c50aeafc2da54665b522bc6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031364Reviewed-by: Lily Chen <chlily@chromium.org>
Commit-Queue: Maksim Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736938}

third_party/blink/web_tests/external/wpt/cookies/http-state/general-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>

third_party/blink/web_tests/external/wpt/cookies/http-state/name-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>