Update navigator.services API to use the new services.onconnect event [1/3].

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 37d12869b9c57593d716e20ac6a0a7ebe26e89fa..0cab9a36f055829690d0764a6d639203c34a13be 100644
--- a/LayoutTests/http/tests/navigatorconnect/resources/echo-worker.js
+++ b/LayoutTests/http/tests/navigatorconnect/resources/echo-worker.js
@@ -4,7 +4,10 @@ self.addEventListener('crossoriginconnect', function(event) {
   event.acceptConnection(true);
 });
 
-
 self.addEventListener('crossoriginmessage', function(event) {
   client.postMessage(event.data, event.ports);
 });
+
+navigator.services.addEventListener('connect', function(event) {
+  event.respondWith({accept: true}).then(function(port) { client = port; });
+});