8253606: Need to add missed constructor to the SwingEventMonitor

Reviewed-by: jdv, pbansal, prr

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

@@ -58,10 +58,6 @@ import javax.accessibility.*;
  */
 public class SwingEventMonitor extends AWTEventMonitor {
 
-    /**
-     * Constructs a {@code SwingEventMonitor}.
-     */
-
     /**
      * The master list of all listeners registered by other classes.
      * This can only be publicly modified by calling the add or
@@ -77,6 +73,11 @@ public class SwingEventMonitor extends AWTEventMonitor {
      */
     static private final SwingEventListener swingListener = new SwingEventListener();
 
+    /**
+     * Constructs a {@code SwingEventMonitor}.
+     */
+    public SwingEventMonitor() {}
+
     /**
      * Adds the specified listener to receive all {@link EventID#ANCESTOR ANCESTOR}
      * events on each component instance in the Java Virtual Machine as they occur.