Bug 1689663 - Don't try to run docshell/test/navigation/test_bug1364364.html with SHIP-BFCache, r=peterv

I think this particular test doesn't make much sense in the new implementation.

Differential Revision: https://phabricator.services.mozilla.com/D109961

docshell/test/navigation/mochitest.ini

@@ -95,7 +95,7 @@ skip-if = toolkit == "android" || toolkit == "windows" # disabled on Windows bec
 [test_bug430723.html]
 skip-if = (!debug && (os == 'mac' || os == 'win')) # Bug 874423
 [test_bug1364364.html]
-skip-if = (os == "android") || fission # Bug 1560378, bug 1666449
+skip-if = (os == "android") # Bug 1560378
 [test_bug1375833.html]
 [test_bug1536471.html]
 support-files = file_bug1536471.html

docshell/test/navigation/test_bug1364364.html

@@ -14,6 +14,15 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=1364364
   let testWin, testDoc;
   async function test() {
     SimpleTest.waitForExplicitFinish();
+    if (SpecialPowers.Services.appinfo.fissionAutostart) {
+      // This test relies on the possibility to modify the bfcached document.
+      // The new implementation is more restricted and thus works only
+      // when the bfcached browsing context is the only top level one
+      // in the browsing context group.
+      ok(true, "This test is for the old bfcache implementation only.");
+      SimpleTest.finish();
+      return;
+    }
     testWin = window.open("file_bug1364364-1.html");
     await waitForLoad(testWin);
     testDoc = testWin.document;