Bug 931641 - Intermittent test_contextmenu_nested.xul failure, r=ehsan

--HG--
extra : rebase_source : c5341f590e827dee214d6e5a0953db6b78665309

toolkit/content/tests/widgets/test_contextmenu_nested.xul

@@ -78,7 +78,9 @@ var popupTests = [
   events: [ "DOMMenuItemActive outercontextmenu", "popupshowing innercontext", "popupshown innercontext" ],
   test: function () {
     synthesizeMouse($("outercontextmenu"), 4, 4, { type: "mousemove" });
-    synthesizeMouse($("outercontextmenu"), 2, 2, { type: "mousemove" });
+    setTimeout(function() {
+        synthesizeMouse($("outercontextmenu"), 2, 2, { type: "mousemove" });
+      }, 1000);
   },
   result: function (testname) {
     is($("outermain").triggerNode, $("popuparea"), testname + " outer");