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

Source/modules/navigatorconnect/ServicePortCollection.idl

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // https://mkruisselbrink.github.io/navigator-connect/#idl-def-ServicePortCollection
 [
     Exposed=(Window,Worker),
     GarbageCollected,
     TypeChecking=Interface,
     RuntimeEnabled=NavigatorConnect,
+    TypeChecking=Interface,
 ]  interface ServicePortCollection : EventTarget {
     [CallWith=ScriptState, RaisesException] Promise<ServicePort> connect(DOMString url, optional ServicePortConnectOptions options);
     [CallWith=ScriptState] Promise<ServicePort> match(ServicePortMatchOptions options);
     [CallWith=ScriptState] Promise<sequence<ServicePort>> matchAll(optional ServicePortMatchOptions options);
     [Exposed=ServiceWorker] attribute EventHandler onconnect;
     attribute EventHandler onmessage;
     attribute EventHandler onclose;
 };