<Swing Dev> [10] RFR 6962725:Regtest javax/swing/JFileChooser/6738668/bug6738668.java fails under Linux

[Prasanta Sadhukhan]

Hi ALl,

Please review a testbug fix for an issue where this regression test is 
failing in linux because
JFileChooser was trying to access C:/temp path which does not exist in 
linux.

Proposed fix is to use java.io.tmpdir instead of hardcoded windows path.

Bug: https://bugs.openjdk.java.net/browse/JDK-6962725
webrev: http://cr.openjdk.java.net/~psadhukhan/6962725/webrev.00/

Regards
Prasanta