Traditional sandbox applet with sandbox attribute in manifest file and signed with trust valid cert should not be blocked, but now it is blocked as "untrusted application" after accepting the signed security warning dialog.

Steps to reproduce:
0) Install jre8 #794
1) Import cert into signer CA from
http://sqeweb.us.oracle.com/deployment2/sheldon/webCases/appletattack2/tmpcert/self.valid.cert
2) Launch the applet from
http://sqeweb.us.oracle.com/deployment2/sheldon/webCases/appletattack2/html/testAppletAttackJRELibAppletSingle.html
3) Accept the signed security warning dialog.
4) If applet is blocked with information:Your security settings have blocked an untrusted applicaiton from running, bug is reproducible.