Remove unused class (#2757)

javaagent-tooling/src/main/java/io/opentelemetry/javaagent/tooling/DaemonThreadFactory.java

@@ -1,33 +0,0 @@
-/*
- * Copyright The OpenTelemetry Authors
- * SPDX-License-Identifier: Apache-2.0
- */
-
-package io.opentelemetry.javaagent.tooling;
-
-import java.util.concurrent.ThreadFactory;
-
-/** A {@link ThreadFactory} implementation that starts all {@link Thread} as daemons. */
-public final class DaemonThreadFactory implements ThreadFactory {
-  public static final DaemonThreadFactory TASK_SCHEDULER =
-      new DaemonThreadFactory("opentelemetry-task-scheduler");
-
-  private final String threadName;
-
-  /**
-   * Constructs a new {@code DaemonThreadFactory} with a null ContextClassLoader.
-   *
-   * @param threadName used to prefix all thread names.
-   */
-  public DaemonThreadFactory(String threadName) {
-    this.threadName = threadName;
-  }
-
-  @Override
-  public Thread newThread(Runnable r) {
-    Thread thread = new Thread(r, threadName);
-    thread.setDaemon(true);
-    thread.setContextClassLoader(null);
-    return thread;
-  }
-}