fixup! Fix last modified test to be more correct and stable.

html/dom/documents/resource-metadata-management/document-lastModified-01.html

@@ -10,7 +10,7 @@
   var expected = Math.round(d / 1000);
 
   test(function() {
-    assert_approx_equals(initial_modified, expected, 1.5);
+    assert_approx_equals(initial_modified, expected, 2.5);
   }, "Date returned by lastModified is current at page load");
 
   var pattern = /[0-9]{2}\/[0-9]{2}\/[0-9]{4} ([0-9]{2}):([0-9]{2}):([0-9]{2})/
@@ -39,8 +39,9 @@
     t.step(function() {
       var new_modified = Date.parse(document.lastModified) / 1000;
       var new_expected = Math.round(new Date() / 1000);
-      assert_approx_equals(new_modified, new_expected, 1.5, "(initial value was " + initial_modified + ")");
+      assert_approx_equals(new_modified, new_expected, 2.5,
+                           "(initial value was " + initial_modified + ")");
       t.done();
     });
-  }, 3000);
+  }, 4000);
 </script>