Bug 1836155 [wpt PR 40332] - [Topics] Refactor header to be easier to…

… read and parse, a=testonly

Automatic update from web-platform-tests
[Topics] Refactor header to be easier to read and parse

Changed the format of the topics request header from:
"t=(1;v=chrome.1:1:2, 2), p=P00000" to
"(1 2);v=chrome.1:1:2, ();p=P00000"

As discussed in patcg-individual-drafts/topics#183

Bug: 1443540
Change-Id: I3ea40df9f8732f5eff953110f22f4da2163480fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4576009
Reviewed-by: Yao Xiao <yaoxia@chromium.org>
Commit-Queue: Josh Karlin <jkarlin@chromium.org>
Reviewed-by: Andrew Paseltiner <apaseltiner@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1151938}

--

wpt-commits: ae92b6b433768fd3b35de1dbff6cc8f03197fdc5
wpt-pr: 40332

testing/web-platform/tests/browsing-topics/resources/header-util.sub.js

@@ -1,4 +1,4 @@
-const EMPTY_TOPICS_HEADER = 't=(), p=P000000000000000000000000000';
+const EMPTY_TOPICS_HEADER = '();p=P0000000000000000000000000000000';
 
 function test_topics_iframe_navigation_header(
     test, has_browsing_topics_attribute, is_same_origin, expect_topics_header_available_func) {