Bug 651136 - Make content/events/test/test_bug238987.html non flaky. r=ehsan

content/events/test/test_bug238987.html

@@ -136,7 +136,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=238987
       setOrRestoreTabFocus(0);
       SimpleTest.finish();
     } else {
-      setTimeout(tab, 50);
+      setTimeout(tab, 0);
     }
   }
 
@@ -161,7 +161,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=238987
 
   function doTest() {
     setOrRestoreTabFocus(7);
-    setTimeout(start, 100);
+    setTimeout(start, 0);
   }
 
   SimpleTest.waitForExplicitFinish();