Spring Boot example: Remove unused class ApplicationLoggingSystem.

Change-Id: I75ce46a6116a02339d2b8e0c6e634cee294d86dd
diff --git a/examples/spring-boot/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/example/ApplicationLoggingSystem.java b/examples/spring-boot/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/example/ApplicationLoggingSystem.java
deleted file mode 100644
index 4050b99..0000000
--- a/examples/spring-boot/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/example/ApplicationLoggingSystem.java
+++ /dev/null
@@ -1,22 +0,0 @@
-package eu.mulk.quarkus.googlecloud.jsonlogging.example;
-
-import org.springframework.boot.logging.LogFile;
-import org.springframework.boot.logging.LoggingInitializationContext;
-import org.springframework.boot.logging.Slf4JLoggingSystem;
-
-public class ApplicationLoggingSystem extends Slf4JLoggingSystem {
-
-  public ApplicationLoggingSystem(ClassLoader classLoader) {
-    super(classLoader);
-  }
-
-  @Override
-  protected String[] getStandardConfigLocations() {
-    return new String[0];
-  }
-
-  @Override
-  protected void loadDefaults(LoggingInitializationContext initializationContext, LogFile logFile) {
-    /* no configuration necessary */
-  }
-}