Bug 1689681 - Ensure docshell/test/navigation/browser_test_bfcache_eviction.js works with SHIP-BFCache r=nika

Depends on D109217

Differential Revision: https://phabricator.services.mozilla.com/D109218

docshell/test/navigation/browser.ini

@@ -8,7 +8,6 @@ support-files =
   bug343515_pg3_2.html
 
 [browser_test_bfcache_eviction.js]
-skip-if = fission # bug 1665165
 [browser_bug343515.js]
 [browser_test-content-chromeflags.js]
 tags = openwindow

docshell/test/navigation/browser_test_bfcache_eviction.js

@@ -5,6 +5,8 @@ add_task(async function() {
     set: [
       ["browser.sessionhistory.max_total_viewers", 3],
       ["docshell.shistory.testing.bfevict", true],
+      // If Fission is disabled, the pref is no-op.
+      ["fission.bfcacheInParent", true],
     ],
   });