RFR(S) 8067723: JVM_DefineClassWithSourceCond is no longer being used

[harold seigel]

Hi,

Please review this small change to remove 
JVM_DefineClassWithSourceCond() from the JVM, because it is no longer used.

Open webrev: http://cr.openjdk.java.net/~hseigel/bug_8067723/

JBS  Bug: https://bugs.openjdk.java.net/browse/JDK-8067723

The fix was tested with the hotspot JTreg tests and other tests.

Thanks, Harold