Added missing @Override annotations.

jetty-proxy/src/main/java/org/eclipse/jetty/proxy/AsyncMiddleManServlet.java

@@ -138,6 +138,7 @@ public class AsyncMiddleManServlet extends AbstractProxyServlet
         return new ProxyWriter(clientRequest, proxyResponse);
     }
 
+    @Override
     protected Response.CompleteListener newProxyResponseListener(HttpServletRequest clientRequest, HttpServletResponse proxyResponse)
     {
         return new ProxyResponseListener(clientRequest, proxyResponse);

jetty-proxy/src/main/java/org/eclipse/jetty/proxy/ProxyServlet.java

@@ -93,6 +93,7 @@ public class ProxyServlet extends AbstractProxyServlet
         return new ProxyInputStreamContentProvider(request, response, proxyRequest, request.getInputStream());
     }
 
+    @Override
     protected Response.Listener newProxyResponseListener(HttpServletRequest request, HttpServletResponse response)
     {
         return new ProxyResponseListener(request, response);