Request for review: 7017673: Remove setting of the sun.jkernel.DownloadManager as a boot classloader hook

[Mandy Chung]

  This change will remove the setting of the sun.jkernel.DownloadManager 
as a boot classloader hook fixed in 6888880 as jkernel will not be 
supported in JDK7:
     http://hg.openjdk.java.net/jdk7/hotspot/hotspot/rev/4b966d9946a3

Webrev at:
    http://cr.openjdk.java.net/~mchung/7017673/webrev.00/

Thanks
Mandy