Need to add missed constructor to the SwingEventMonitor

Summary

Need to add a missed constructor to the SwingEventMonitor, the javadoc was added to this class w/o CSR but the actual constructor was not added.

Solution

Add a constructor.

Specification

src/jdk.accessibility/share/classes/com/sun/java/accessibility/util/SwingEventMonitor.java

  */
 public class SwingEventMonitor extends AWTEventMonitor {

-    /**
-     * Constructs a {@code SwingEventMonitor}.
-     */
-     
+    /**
+     * Constructs a {@code SwingEventMonitor}.
+     */
+    public SwingEventMonitor() {}
+