Update navigator.services API to use the new services.onconnect event [3/3].

LayoutTests/http/tests/navigatorconnect/resources/echo-worker.js

Index: LayoutTests/http/tests/navigatorconnect/resources/echo-worker.js
diff --git a/LayoutTests/http/tests/navigatorconnect/resources/echo-worker.js b/LayoutTests/http/tests/navigatorconnect/resources/echo-worker.js
index 0cab9a36f055829690d0764a6d639203c34a13be..fa281ec730929306a6a12aed048e82de2a41713b 100644
--- a/LayoutTests/http/tests/navigatorconnect/resources/echo-worker.js
+++ b/LayoutTests/http/tests/navigatorconnect/resources/echo-worker.js
@@ -1,9 +1,4 @@
 var client;
-self.addEventListener('crossoriginconnect', function(event) {
-  client = event.client;
-  event.acceptConnection(true);
-});
-
 self.addEventListener('crossoriginmessage', function(event) {
   client.postMessage(event.data, event.ports);
 });