Review request for 6899607: Update java.util.prefs.FileSystemPreferences to use PlatformLogger

[Mandy Chung]

Sherman,

I modified src/windows/classes/java/util/prefs/WindowsPreferences.java 
to use sun.util.logging.PlatformLogger in the fix for 6882376 but missed 
src/solaris/classes/java/util/prefs/FileSystemPreferences.java.

This fix is to update java.util.prefs.FileSystemPreferences to use 
PlatformLogger.

Webrev at:
   http://cr.openjdk.java.net/~mchung/6899607/webrev.00/

Thanks
Mandy