[webkit] [9] Review request for 8157509: UserDataDirectoryTest fails on Windows platforms with updated WebKit

[Arunprasad Rajkumar]

Hello Kevin, Guru, Murali,

Please review the fix for UserDataDirectoryTest failure.
JIRA: https://bugs.openjdk.java.net/browse/JDK-8157509

Webrev: http://cr.openjdk.java.net/~arajkumar/8157509/webrev.00

Issue: New WebKit takes around 5 mins to close the sqlite-db file 
associated with localStorage. Problem is evident in Windows because of 
the file system behavior.

Solution: Try File.delete(..), if it fails defer the deletion task to VM 
shutdown using File.deleteOnExit(..).

Regards,
Arun