Bug 1600442 - Add release or beta expectations for sandbox-disallow-scripts-via-unsandboxed-popup.tentative.html. r=jgraham

Differential Revision: https://phabricator.services.mozilla.com/D55369

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

testing/web-platform/meta/html/browsers/sandboxing/sandbox-disallow-scripts-via-unsandboxed-popup.tentative.html.ini

@@ -1,5 +1,9 @@
 [sandbox-disallow-scripts-via-unsandboxed-popup.tentative.html]
-  expected: TIMEOUT
+  bug: 1600442
+  expected: 
+    if release_or_beta: ["OK", "TIMEOUT"] 
+    TIMEOUT
   [Sandboxed => unsandboxed popup]
-    expected: TIMEOUT
-
+    expected: 
+      if release_or_beta: ["FAIL", "TIMEOUT"] 
+      TIMEOUT