[wpt] Update wpt meta data for Marionette page load improvements..

Differential Revision: https://phabricator.services.mozilla.com/D96175

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1669005
gecko-commit: 417047568b4b331d9f9cf4f252edc6566adfe983
gecko-reviewers: jgraham, marionette-reviewers, maja_zf
diff --git a/fetch/corb/script-resource-with-json-parser-breaker.tentative.sub.html b/fetch/corb/script-resource-with-json-parser-breaker.tentative.sub.html
index d469447..1a8095e 100644
--- a/fetch/corb/script-resource-with-json-parser-breaker.tentative.sub.html
+++ b/fetch/corb/script-resource-with-json-parser-breaker.tentative.sub.html
@@ -1,4 +1,5 @@
 <!DOCTYPE html>
+<meta charset="utf-8">
 <!-- Test verifies CORB will block responses beginning with a JSON parser
   breaker regardless of their MIME type (excluding text/css - see below).
 
@@ -18,7 +19,6 @@
   style-css-with-json-parser-breaker.sub.html) can parse as valid stylesheet
   even in presence of a JSON parser breaker.
 -->
-<meta charset="utf-8">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <div id=log></div>