<AWT Dev> [9] Review Request: 6475361 Attempting to remove help menu from java.awt.MenuBar throws NullPointerException

[Sergey Bylokhov]

Hello.
Please review a fix for jdk 9.
All problems mentioned in the CR were fixed:
  - Menu.isHelpMenu will be changed to false when a menu is removed from 
the MenuBar.
  - MenuBar.helpMenu will be changed to null when a menu is removed from 
the MenuBar.
  - MenuBar.setHelpMenu now handle null w/o NPE. (Initially this code 
behaved in the same way, but long long time ago in 1996 this "m.parent" 
code was added outside of null check)

Bug: https://bugs.openjdk.java.net/browse/JDK-6475361
Webrev can be found at: http://cr.openjdk.java.net/~serb/6475361/webrev.00

-- 
Best regards, Sergey.