Bug 1594928: Follow-up: Actually re-enable the test.

Differential Revision: https://phabricator.services.mozilla.com/D52780

--HG--
extra : moz-landing-system : lando

docshell/test/browser/browser.ini

@@ -122,7 +122,7 @@ support-files =
 skip-if = (verify && !debug && os == 'mac') || (os == 'linux') || (os == 'mac') # Bug 1423959
 [browser_multiple_pushState.js]
 [browser_onbeforeunload_navigation.js]
-skip-if = fission || (os == 'win' && !debug) # bug 1300351
+skip-if = (os == 'win' && !debug) # bug 1300351
 [browser_search_notification.js]
 [browser_tab_touch_events.js]
 [browser_timelineMarkers-01.js]