8276218: JFR: Clean up jdk.jfr.dcmd

Reviewed-by: mgronlun

Author: egahlin

src/jdk.jfr/share/classes/jdk/jfr/internal/dcmd/AbstractDCmd.java

@@ -75,7 +75,6 @@ public final String[] execute(String source, String arg, char delimiter) throws
         try {
             boolean log = Logger.shouldLog(LogTag.JFR_DCMD, LogLevel.DEBUG);
             if (log) {
-                System.out.println(arg);
                 Logger.log(LogTag.JFR_DCMD, LogLevel.DEBUG, "Executing " + this.getClass().getSimpleName() + ": " + arg);
             }
             ArgumentParser parser = new ArgumentParser(getArgumentInfos(), arg, delimiter);

src/jdk.jfr/share/classes/jdk/jfr/internal/dcmd/DCmdStart.java

@@ -58,8 +58,6 @@
 //Instantiated by native
 final class DCmdStart extends AbstractDCmd {
 
-    private Object source;
-
     @Override
     public void execute(ArgumentParser parser) throws DCmdException {
         String name = parser.getOption("name");