Remove unused class

dd-java-agent/instrumentation/java-concurrent/scala-testing/src/test/java/AsyncChild.java

@@ -1,44 +0,0 @@
-import datadog.trace.api.Trace;
-import java.util.concurrent.Callable;
-import java.util.concurrent.atomic.AtomicBoolean;
-
-public class AsyncChild implements Runnable, Callable {
-  private final AtomicBoolean blockThread;
-  private final boolean doTraceableWork;
-
-  public AsyncChild() {
-    this(true, false);
-  }
-
-  public AsyncChild(final boolean doTraceableWork, final boolean blockThread) {
-    this.doTraceableWork = doTraceableWork;
-    this.blockThread = new AtomicBoolean(blockThread);
-  }
-
-  public void unblock() {
-    blockThread.set(false);
-  }
-
-  @Override
-  public void run() {
-    runImpl();
-  }
-
-  @Override
-  public Object call() throws Exception {
-    runImpl();
-    return null;
-  }
-
-  private void runImpl() {
-    if (doTraceableWork) {
-      asyncChild();
-    }
-    while (blockThread.get()) {
-      // busy-wait to block thread
-    }
-  }
-
-  @Trace(operationName = "asyncChild")
-  private void asyncChild() {}
-}