8075964: Test java/awt/Mouse/TitleBarDoubleClick/TitleBarDoubleClick.html fails intermittently with timeout error

Backport-of: b0fddb9f8045cca10b4e757d8d187af7fb117405

Author: mrserb

jdk/test/java/awt/Mouse/TitleBarDoubleClick/TitleBarDoubleClick.java

@@ -71,7 +71,6 @@ public void start ()
             frame.addMouseListener(this);
             frame.addWindowListener(this);
             frame.setVisible(true);
-            Util.waitForIdle(robot);
     }// start()
 
     // Move the mouse into the title bar and double click to maximize the