fix import

Author: rbri

src/main/java/org/htmlunit/WebClient.java

@@ -60,7 +60,6 @@
 import org.apache.http.NoHttpResponseException;
 import org.apache.http.client.CredentialsProvider;
 import org.apache.http.cookie.MalformedCookieException;
-import org.eclipse.jetty.websocket.api.WebSocketAdapter;
 import org.htmlunit.attachment.Attachment;
 import org.htmlunit.attachment.AttachmentHandler;
 import org.htmlunit.csp.Policy;