7120869: javax/swing/JScrollBar/4708809/bug4708809.java fails on Windows

The robot auto-delay is increased to fix the test failing on Windows.

Reviewed-by: alexp
diff --git a/jdk/test/javax/swing/JScrollBar/4708809/bug4708809.java b/jdk/test/javax/swing/JScrollBar/4708809/bug4708809.java
index e60af12..912ae5f 100644
--- a/jdk/test/javax/swing/JScrollBar/4708809/bug4708809.java
+++ b/jdk/test/javax/swing/JScrollBar/4708809/bug4708809.java
@@ -44,7 +44,7 @@
     public static void main(String[] args) throws Exception {
         SunToolkit toolkit = (SunToolkit) Toolkit.getDefaultToolkit();
         Robot robot = new Robot();
-        robot.setAutoDelay(50);
+        robot.setAutoDelay(350);
 
         SwingUtilities.invokeAndWait(new Runnable() {