Bug 469042 - Implement SimpleTest.executeSoon for non-Mozilla browsers. r=sayrer

testing/mochitest/tests/SimpleTest/SimpleTest.js

@@ -206,14 +206,19 @@ SimpleTest.waitForExplicitFinish = function () {
  * working (or finish).
  */
 SimpleTest.executeSoon = function(aFunc) {
-    var tm = Components.classes["@mozilla.org/thread-manager;1"]
-                       .getService(Components.interfaces.nsIThreadManager);
+    if ("Components" in window && "classes" in window.Components) {
+        netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+        var tm = Components.classes["@mozilla.org/thread-manager;1"]
+                   .getService(Components.interfaces.nsIThreadManager);
 
-    tm.mainThread.dispatch({
-        run: function() {
-            aFunc();
-        }
-    }, Components.interfaces.nsIThread.DISPATCH_NORMAL);
+        tm.mainThread.dispatch({
+            run: function() {
+                aFunc();
+            }
+        }, Components.interfaces.nsIThread.DISPATCH_NORMAL);
+    } else {
+        setTimeout(aFunc, 0);
+    }
 }
 
 /**