[java] Removing unused vars in SeleniumManager.java

[skip ci]

Author: diemol

java/src/org/openqa/selenium/manager/SeleniumManager.java

@@ -61,9 +61,6 @@ public class SeleniumManager {
 
   private static final String SELENIUM_MANAGER = "selenium-manager";
   private static final String EXE = ".exe";
-  private static final String INFO = "INFO";
-  private static final String WARN = "WARN";
-  private static final String DEBUG = "DEBUG";
 
   private static volatile SeleniumManager manager;