Remove showModalDialog layout tests

ManualTests/js-timers-beneath-modal-dialog.html

Index: ManualTests/js-timers-beneath-modal-dialog.html
diff --git a/ManualTests/js-timers-beneath-modal-dialog.html b/ManualTests/js-timers-beneath-modal-dialog.html
deleted file mode 100644
index 6d5f2c7edf81aba675f2cd631b82df52c1e5e5e8..0000000000000000000000000000000000000000
--- a/ManualTests/js-timers-beneath-modal-dialog.html
+++ /dev/null
@@ -1,19 +0,0 @@
-<p>JS timers should be paused while a modal dialog (or alert) is displayed.</p>
-<p>Please disable popup blocker for this test.</p>
-<div>0</div>
-<script>
-function f()
-{
-    var d = document.getElementsByTagName("div")[0];
-    d.innerHTML = parseInt(d.innerHTML) + 1;
-}
-
-var timerId = setInterval(f, 100);
-
-alert("Numbers in main window should not increase while this alert is displayed");
-showModalDialog("data:text/html,<p>Numbers in main window should not increase while this modal dialog is displayed</p>");
-document.getElementsByTagName("div")[0].innerHTML = "DONE";
-
-clearInterval(timerId);
-
-</script>